Though some books, including Kurt Beyer's Grace Hopper and the Invention of the Information Age, reported that Hopper was the first woman to earn a Yale PhD in mathematics, the first of ten women prior to 1934 was Charlotte Cynthia Barnum (1860-1934). Murray, Margaret A. M. (May/June 2010). "The first lady of math?". Yale Alumni Magazine. 73 (5). hlm. 5–6. ISSN0044-0051.Periksa nilai tanggal di: |publication-date= (bantuan)