Delonte Maurice West (born July 26, 1983) is an American professional basketball player who played in the National Basketball Association (NBA) for the Boston Celtics, Seattle SuperSonics, Cleveland Cavaliers, and Dallas Mavericks.
 He also played professionally for the Fujian Xunxing and Shanghai Sharks of the Chinese Basketball Association and the Texas Legends of the NBA Development League.
 Prior to playing professionally, West played college basketball for Saint Joseph's University.
Tyson Cleotis Chandler (born October 2, 1982) is an American professional basketball player for the Phoenix Suns of the National Basketball Association (NBA).
 Chandler was the second overall pick of the 2001 NBA draft by the Los Angeles Clippers, then was immediately traded to the Chicago Bulls.
 He has also played for the New Orleans Hornets, Charlotte Bobcats, Dallas Mavericks, and New York Knicks.
 As starting center for Dallas, he played an integral role in the franchise's first NBA championship in 2011.
 He was also a member of the United States men's national basketball team's gold medal runs in the 2010 FIBA World Championship and the 2012 Summer Olympics.
 He plays the center position.
The Dallas Mavericks are an American professional basketball team based in Dallas, Texas.
 They play in the Southwest Division of the Western Conference in the National Basketball Association (NBA).
 The team joined the NBA in 1980 as an expansion team, and won their first Western Conference championship in 2006.
 The Mavericks have played their home games at the American Airlines Center since 2001.
 The Mavericks are owned by Mark Cuban, and Donnie Nelson is their general manager.
Jameer Nelson (born February 9, 1982) is an American professional basketball player for the Denver Nuggets of the National Basketball Association (NBA).
 He played college basketball for Saint Joseph's University, where he was named National college player of the year in 2004.
 Drafted 20th overall in the 2004 NBA draft, Nelson spent the first ten years of his NBA career with the Orlando Magic.
 He has also played for the Dallas Mavericks and Boston Celtics.
 In 2009, he helped Orlando reach the NBA Finals and was named an All-Star.
Rajon Pierre Rondo (born February 22, 1986) is an American professional basketball player for the New Orleans Pelicans of the National Basketball Association (NBA).
 He is a four-time NBA All-Star, and a four-time NBA All-Defensive Team member.
 He also led the NBA in steals during the 2009–10 season, and assists during the 2011–12, 2012–13 and 2015–16 seasons.
 He began his professional career with the Boston Celtics, winning an NBA championship in 2008.
 He ranks fourth in Celtic history in assists, and third in steals.
 He briefly played for the Dallas Mavericks during the 2014–15 season before joining the Sacramento Kings in 2015 and the Chicago Bulls in 2016.
The 21 Irrefutable Laws of Leadership: Follow Them and People Will Follow You is a 1998 book written by John C. Maxwell and published by Thomas Nelson.
 It is one of several books by Maxwell on the subject of leadership.
 It is the book for which he is best-known.
 The book was listed on "The New York Times" Best Seller list in April 1999 after marketing company ResultSource manipulated the list by making it look like copies of "The 21 Irrefutable Laws of Leadership" had been purchased by thousands of individuals when, in actuality, ResultSource had simply made a bulk order of the book.
 The book had sold more than one million copies by 2015.
 Christian businessperson John Faulkner was inspired to found Christian business magazine "TwoTen" when he read "The 21 Irrefutable Laws of Leadership".
 Professional basketball player Harrison Barnes read and spoke positively of the book.
 Annie Grevers of "Swimming World Magazine" wrote of Maxwell's book, "it's cheesy, but ... it did me some good".
 Columnist Michael Hiltzik of the "Los Angeles Times" criticized Maxwell for including in the book "the insidious subtext ... that externalities have nothing to do with your failure", an assertion that Hiltzik argues research studies have demonstrated to be false.
Harrison Bryce Jordan Barnes (born May 30, 1992) is an American professional basketball player for the Dallas Mavericks of the National Basketball Association (NBA).
 He played college basketball for the North Carolina Tar Heels before being selected by the Golden State Warriors in the first round of the 2012 NBA draft with the seventh overall pick.
 Barnes won an NBA championship with the Warriors in 2015.
José Juan "J. J." Barea Mora (born June 26, 1984) is a Puerto Rican professional basketball player for the Dallas Mavericks of the National Basketball Association (NBA).
 He played college basketball for Northeastern University before joining the Mavericks in 2006 and becoming just the seventh Puerto Rican to play in the NBA.
 He went on to win an NBA championship with the Mavericks in 2011 before signing with the Minnesota Timberwolves where he played for the next three seasons.
 He has also played in the NBA Development League and the Baloncesto Superior Nacional.
Kristopher Nathan Humphries (born February 6, 1985) is an American professional basketball player for the Philadelphia 76ers of the National Basketball Association (NBA).
 He has also played in the NBA for the Utah Jazz, Toronto Raptors, Dallas Mavericks, New Jersey / Brooklyn Nets, Boston Celtics, Washington Wizards, and Phoenix Suns.
 Humphries played college basketball for the Minnesota Golden Gophers of the University of Minnesota, and for the United States men's national basketball team.
The 2010–11 Dallas Mavericks season was the 31st season of the franchise in the National Basketball Association (NBA).
 The Mavericks won the NBA Championship after defeating the Miami Heat in 6 games in the 2011 NBA Finals.
 The Mavs playoff run came with a 6-game first round series against the Portland Trail Blazers, a series in which the Mavericks blew a 23-point lead in Game 4, but still won the series.
 In the conference semi-finals, the Mavericks run was motivated with a sweep of the champions of the previous two seasons, the Los Angeles Lakers.
 The series against the Lakers also became the birth of the Mavericks Royal Blue-Out games in the AAC, with almost all fans wearing T-shirts that read "The Time is Now".
 In the Western Conference Finals against the Oklahoma City Thunder, the Mavericks won the last 3 games winning by 4th quarter comebacks, to win their second Western Conference Championship, and a trip to the NBA Finals for the first time since 2006, with a rematch against the Heat.
 Following a disappointing Game 1, the Mavericks pulled the biggest comeback in NBA Finals history in Game 2 to even the series at 1 game each.
 After a loss in Game 3, the Mavericks won the last two games in Dallas to take a 3–2 series lead heading to Game 6 in Miami.
 The Mavericks won their first NBA Championship in Game 6 to clinch the first major sports championship in the Dallas-Fort Worth area since the Dallas Stars in 1999, and the first title in Mavericks franchise history.
 The Mavericks are the third team to win an NBA title in the state of Texas, joining the Houston Rockets and San Antonio Spurs.
 The Mavericks are also the third team to win a major sports championship in the Dallas-Fort Worth area, joining the Dallas Cowboys' five Super Bowl titles and the Dallas Stars' only Stanley Cup, leaving the Texas Rangers as the only team to not win a major sports title in the area, as they have not won the World Series.
 The Mavericks championship parade was held on June 16, 2011 in downtown Dallas.

Question: Which of the American professional basketball player for the Dallas Mavericks of the National Basketball Association (NBA) spoke well about  "The 21 Irrefutable Laws of Leadership"?
Answer: Harrison Barnes