Melnick, L. (Rodgers). Three to make music. [Phonodisc] 1959.
ASCAP, 4th ed. (Guettel, Mary Rodgers (Mary Rodgers); b. Jan. 11, 1931, New York, NY; composer, author)
Variety's ww in show business, 1989 (Rodgers, Mary; b. Jan. 11, 1931, New York City; composer, writer)
Contemp. authors, new rev. series, v. 55 (Rodgers, Mary, 1931-; b. Jan. 11, 1931; novelist, screenwriter, composer, lyricist)
U.S. copyright file, Jan. 21, 2000 (Rodgers, Mary (Mary Rodgers a.k.a. Mary Rodgers Beaty, Mary Rodgers a.k.a. Mary Rodgers Guettel)
Wikipedia, 2 Nov. 2010 (Mary Rodgers (born January 11, 1931) is an American composer of musicals and an author of children's books, has written music for Once upon a mattress, and the children's book Freaky Friday)
New York times (online), viewed June 30, 2014 (in obituary published June 27: Mary Rodgers; b. Jan. 11, 1931, Manhattan; daughter of Richard Rodgers; m. Julian (Jerry) Beaty Jr. (div.); m. Henry Guettel (d. last fall); d. Thursday [June 26, 2014], Manhattan, aged 83; probably best known for writing the music for Once upon a mattress and for writing Freaky Friday)