At the circus [MP] 1939 credits (lyrics by E.Y. Harburg)
LC in OCLC, 1-9-87 (hdg.: Harburg, Edgar Y., 1896- ; usage: E.Y. Harburg)
McCorkle, S. The songs of E.Y. "Yip" Harburg [SR] 1981.
New Grove dict. of Amer. music, 1986 (Harburg, E(dgar) Y. [Yip]; Hochberg, Isidore, b. 8 Apr, 1898, d. 5 Mar. 1981; lyricist and librettist)
New Grove dict. of music and musicians, 2000 p. 842 (E. Y. Harburg, b. April 8, 1896, d. Mar. 5, 1981)
Internet movie database, Mar. 20, 2002 (Edgar Y. Harburg, b. April 8, 1896, d. Mar. 4, 1981)
Halliwell's who's who in the movies, c2001 p. 198 (Edgar "Yip" Harburg, 1896-1981)
Katz, E. The film encyclopedia, c2001 p. 142 (E. Y. Harburg, 1896-1981)
Grove music online, Mar. 3, 2011 (Harburg, E(dgar) Y(ipsel) (Yip) (Hochberg, Isidore); b. Apr. 8, 1896, New York; d. Mar. 5, 1981, Brentwood, CA; American lyricist and librettist)
SSDI, Mar. 3, 2011 (Harburg, Edgar; b. Apr. 8, 1896; d. Mar. 1981, aged 84; last address of record: New York, NY)