Sam Irvin. Kay Thompson: From Funny Face to Eloise. This biography of the "entertainer and world-class eccentric" contains several pages about the subject's experiences in the pre-Broadway phase of the 1937 Harburg-Arlen musical Hooray for What! NY: Simon & Schuster, 2010.
David Jenness and Don Velsey. Classic American Popular Song: The Second Half-Century, 1950-2000. NY: Routledge, 2006. Contains commentary on several of Yip's lesser-known lyrics.
Herbert Keyser. Geniuses of the American Musical Theatre: The Composers and Lyricists. Applause Books, 2009. Contains a beautifully illustrated chapter on Yip.
Richard Koszarski. Hollywood on the Hudson: Film and Television in New York from Griffith to Sarnoff, Rutgers University Press, 2008. Several passages of this thorough history discuss Yip's little-known lyric writing stint at Paramount's Long Island Astoria Studios from 1929 through the early 1930's.