Not sure if these have been mentioned...Original Gangstas: The Untold Story of Dr. Dre, Eazy-E, Ice Cube, Tupac Shakur, and the Birth of West Coast Rap By Ben WesthoffThe History of Gangster Rap: From Schoolly D to Kendrick Lamar, the Rise of a Great American Art By Soren Baker2pac vs. Biggie: An Illustrated History of Rap’s Greatest Battle by Jeff WeissThe Dirty Version: On Stage, in the Studio, and in the Streets with Ol' Dirty Bastard By Buddha MonkEnter The Wu-Tang: How Nine Men Changed Hip-Hop Forever: How Nine Men Changed Hip-Hop by OKP’s own “Spirit”RAW: My Journey into the Wu-Tang by U-GodSweat the Technique: Revelations on Creativity from the Lyrical Genius by RakimBlack Noise - Tricia Rose