Methuen's History of Medieval and Modern Europe: A history of Europe from 476 to 911 [by] Margaret Deanesly [online]. Methuen, 1931 [cit. 2021-05-25]. Dostupné online. (anglicky)
SISMONDI, Jean-Charles-Léonard Simonde. The French Under the Merovingians and the Carlovingians [online]. AMS Press, 1976 [cit. 2021-05-25]. Dostupné online. ISBN978-0-404-56669-2. (anglicky)