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Joyce Harvey & Marilyn Ogilvie (2000), The Biographical Dictionary of Women in Science, Volume 1, pp. 621 et seq
Campbell, Kenneth E., Jr., editor. 1980. "Papers in Avian Paleontology Honoring Hildegarde Howard", Contributions in Science: Natural History Museum of Los Angeles County, No. 330 (Sept. 15 1970), 296 p. (Includes biographical sketches and a bibliography of her works.)
Campbell, Kenneth E. Jr (2000). “In Memoriam: Hildegarde Howard, 1901-1998”. The Auk 117 (3): 775–779. doi:10.2307/4089601. JSTOR 4089601.
Campbell, Kenneth E. Jr (2000). “Hildegarde Howard”. Society of Vertebrate Paleontology News Bulletin 178: 131–133.