APA (7th ed.) Citation

Fröhlich, R. (1998). Gregor I. der Große.

Chicago Style (17th ed.) Citation

Fröhlich, Roland. Gregor I. Der Große. 1998.

MLA (9th ed.) Citation

Fröhlich, Roland. Gregor I. Der Große. 1998.

Warning: These citations may not always be 100% accurate.