Nelson, Janet L. (1978). "Queens as Jezebels: The Careers of Brunhild and Balthild in Merovingian History". Studies in Church History. Subsidia. 1: 31–77. doi:10.1017/S0143045900000338.
Geaman, Kristen Lee (2013). Childless queens and child-like kings: negotiating royal infertility in England, 1382-1471 (Thesis). University of Southern California Digital Library (USC.DL). doi:10.25549/usctheses-c3-258297.[page needed]
