APA (7th ed.) Citation

Helmold, a. 1. 1., & Tschan, F. J. (1935). The chronicle of the Slavs. Columbia university press.

Chicago Style (17th ed.) Citation

Helmold, approximately 1120-approximately 1177, and Francis Joseph Tschan. The Chronicle of the Slavs. New York: Columbia university press, 1935.

MLA (8th ed.) Citation

Helmold, approximately 1120-approximately 1177, and Francis Joseph Tschan. The Chronicle of the Slavs. Columbia university press, 1935.