"Critic Kenneth Tynan Has Mellowed But Is Still England's Stingingest Gadfly" by Godfrey Smith, The New York Times, archive.nytimes.com. January 09, 1966.
"Interview: Why Is Maurice Sendak So Incredibly Angry?". Interview with Leonard S. Marcus, Parenting Magazine (October 1993); later quoted in Leonard S. Marcus "Ways of Telling: Conversations on the Art of the Picture Book" (p. 181), 2002.