Question: Are Allen Drury and Amy Tan both authors?

Context articles: Two Kinds
A Shade of Difference
Amy Tan
Decision (novel)
Preserve and Protect
Anna Hastings
Mark Coffin, U.S.S.
Allen Drury's University series
Allen Drury
Capable of Honor

"Two Kinds" is a short story from the book "The Joy Luck Club" by Amy Tan.
 It was first published in 1989.
 The short story outlines the main character Jing-mei Woo’s childhood and the effects of her mother’s high expectations for her life.
 It is clear that some of the events in the short story reflect events that happened in the author’s life.
 For example, the main character's mother left China, leaving behind her family and children.
 The same is true with Amy Tan's mother.
 In 1993, a movie based on the book was made.
A Shade of Difference (ISBN  ) is a 1962 political novel written by Allen Drury.
 It is the first sequel to "Advise and Consent", for which Drury was awarded the Pulitzer Prize for Fiction in 1960, and was followed in 1966 by "Capable of Honor".
Amy Tan (born February 19, 1952) is an American writer whose works explore mother-daughter relationships and the Chinese American experience.
 Her novel "The Joy Luck Club" was adapted into a film in 1993 by director Wayne Wang.
Decision is a 1983 political novel by Allen Drury which follows a newly appointed Supreme Court Justice as he is faced with the most difficult decision of his life.
 It is a standalone work set in a different fictional timeline from Drury's 1959 novel "Advise and Consent", which earned him a Pulitzer Prize for Fiction.
Preserve and Protect is a 1968 political novel written by Allen Drury.
 It is the third sequel to "Advise and Consent", for which Drury was awarded the Pulitzer Prize for Fiction in 1960, and is followed by two alternate sequels of its own, "Come Nineveh, Come Tyre" (1973) and "The Promise of Joy" (1975).
Anna Hastings: The Story of a Washington Newspaperperson is a 1977 political novel by Allen Drury which follows the titular reporter as she climbs her way to the top of the Washington media elite.
 It is set in a different fictional timeline from Drury's 1959 novel "Advise and Consent", which earned him a Pulitzer Prize for Fiction.
Mark Coffin U.S.S. is a 1979 political novel by Allen Drury which follows the titular young U.S. Senator as he navigates Washington politics.
 It is set in a different fictional timeline from Drury's 1959 novel "Advise and Consent", which earned him a Pulitzer Prize for Fiction.
Allen Drury's "University" series is a trio of novels written by political novelist Allen Drury between 1990 and 1998, which follow a group of university fraternity brothers for a span of over 60 years from 1938 to 2001.
 Drury graduated from Stanford University in 1939, and his experiences there provided the basis for the series.
 The novels are set in a different fictional timeline from Drury's 1959 novel "Advise and Consent", which earned him a Pulitzer Prize for Fiction.
Allen Stuart Drury (September 2, 1918 – September 2, 1998) was an American novelist.
 He wrote the 1959 novel "Advise and Consent", for which he won the Pulitzer Prize for Fiction in 1960.
Capable of Honor is a 1966 political novel written by Allen Drury.
 It is the second sequel to "Advise and Consent", for which Drury was awarded the Pulitzer Prize for Fiction in 1960.