Some observers count six classic albums, some count five, and others count four. Bogdanov, Vladimir; Woodstra, Chris; Erlewine, Stephen Thomas (2001). All music guide: the definitive guide to popular music (4 ed.). Hal Leonard Corporation. pp. 447–448. ISBN0-87930-627-0. Stevie Wonder came into his own with Music of My Mind, but Talking Book is where he hit his stride... Cramer, Alfred William (2009). Musicians and composers of the 20th century. Vol. 5. Salem Press. p. 1645. ISBN978-1-58765-517-3. Brown, Jeremy K. (2010). Stevie Wonder: Musician. Black Americans of Achievement. Infobase Publishing. p. 57. ISBN978-1-60413-685-2.