APA (7th ed.) Citation

Otto I, B. o. F., Mierow, C. C., Evans, A. P., & Knapp, C. (1966). The two cities: A chronicle of universal history to the year 1146 A.D. Octagon Books.

Chicago Style (17th ed.) Citation

Otto I, Bishop of Freising, Charles Christopher Mierow, Austin P. Evans, and Charles Knapp. The Two Cities: A Chronicle of Universal History to the Year 1146 A.D. New York: Octagon Books, 1966.

MLA (9th ed.) Citation

Otto I, Bishop of Freising, et al. The Two Cities: A Chronicle of Universal History to the Year 1146 A.D. Octagon Books, 1966.