APA (7th ed.) Citation

Morrison, K. F., Wippo, P., & Heinrich$Biv, E. o. G. (1962). Imperial lives and letters of the eleventh century. Columbia University Press.

Chicago Style (17th ed.) Citation

Morrison, Karl F., Presbyter Wippo, and Emperor of Germany Heinrich$Biv. Imperial Lives and Letters of the Eleventh Century. New York: Columbia University Press, 1962.

MLA (8th ed.) Citation

Morrison, Karl F., et al. Imperial Lives and Letters of the Eleventh Century. Columbia University Press, 1962.