Graceanna Lewis and the Delaware County Institute of Science [online]. Historical Society of Pennsylvania, 2014-08-27 [cit. 2020-05-23]. Dostupné online.
An Inventory of the Lewis-Fussell Family Papers, 1698-1978 [online]. Swarthmore College Friends Historical Library [cit. 2020-05-23]. Dostupné online.
web.archive.org
Barbara Morgan, "Graceanna Lewis," in Women in World History: A Biographical Encyclopedia: Volume 9: Laa to Lyud. Farmington Hills, MI: Gale Group, 1999. (Subscription required).