R. LeRoy Bannerman. Norman Corwin and Radio: The Golden Years. University of Alabama Press, 1986. Contains passages about CBS radio programs on which Yip collaborated with Corwin during the 1940's.
Stephen Banfield. Jerome Kern. Yale Broadway Masters Series. Yale University Press, 2006. Contains a section about the songs Yip wrote with Kern for the 1944 motion picture Can't Help Singing.
Caryl Brahms and Ned Sherrin.Song by Song: 14 Great Lyric Writers. England: Ross Anderson Publications, 1984. Chapter 8: "E.Y. Harburg: Somewhere Over the Rainbow," p. 118.
Caryl Flinn. Brass Diva: The Life and Legends of Ethel Merman. University of California Press, 2007. Provides details about the Paramount-Astoria film shorts in which Merman sang songs with lyrics by Yip
John Fricke, Jay Scarfone, and William Stillman. The Wizard of Oz: The Official 50th Anniversary Pictorial History. Introduction by Jack Haley, Jr. Warner, 1989.