APA (7th ed.) Citation

Helmold, a. 1. 1., & Tschan, F. J. (1966). The chronicle of the Slavs. Octagon Books.

Chicago Style (17th ed.) Citation

Helmold, approximately 1120-approximately 1177, and Francis Joseph Tschan. The Chronicle of the Slavs. New York: Octagon Books, 1966.

MLA (9th ed.) Citation

Helmold, approximately 1120-approximately 1177, and Francis Joseph Tschan. The Chronicle of the Slavs. Octagon Books, 1966.