Riddle, Larry (January 10, 2014), "Marie Litzinger", Biographies of Women Mathematicians, Agnes Scott College, retrieved 2015-12-26.
archive.org
Bryn Mawr College. Alumnae Association (1936). Bryn Mawr Alumnae Bulletin, 1936. Special Collections Bryn Mawr College Library. Bryn Mawr, PA: Bryn Mawr Alumnae Association.
Scott, Fred W. (July 2008). Dr. Jean Holzworth, feline practitioner extraordinaire. 20th Annual Fred Scott Feline Symposium. Cornell University College of Veterinary Medicine. hdl:1813/34868. [This contribution is numbered as pp. 1–4, but appears on pp. 42–45 of the PDF.]