Which of these titles are by Walter Dean Myers and which are by Rick Riordan Jr.? Hoops, The Legend of Tarik, Ambush in the Amazon, Crystal, The Life of a Harlem Man, The Lost Hero, The Titan's Curse, The Lightning Thief, The Red Pyramid, The Demigod Diaries

Walter Dean Myers titles: Hoops, The Legend of Tarik, Ambush in the Amazon, Crystal, The Life of a Harlem Man 
Rick Riordan Jr. titles: The Lost Hero, The Titan's Curse, The Lightning Thief, The Red Pyramid, The Demigod Diaries