APA (7th ed.) Citation

Einhard, Ganz, . D., & The Stammerer, . N. (2008). Two lives of charlemagne. ‎ Penguin Books.

Chicago Style (17th ed.) Citation

Einhard, David Ganz, and Notker The Stammerer. Two Lives of Charlemagne. New York: ‎ Penguin Books, 2008.

MLA (9th ed.) Citation

Einhard, et al. Two Lives of Charlemagne. ‎ Penguin Books, 2008.