APA (7e ed.) Bronvermelding

Kaplan, U., Kennedy, W., & Scheer, U. (2006). The Bottrop Formation ammonites, Campanian, western Munsterland.

Chicago (17e ed.) Bronvermelding

Kaplan, UK, W. Kennedy, en U. Scheer. The Bottrop Formation Ammonites, Campanian, Western Munsterland. 2006.

MLA (9e ed.) Bronvermelding

Kaplan, UK, et al. The Bottrop Formation Ammonites, Campanian, Western Munsterland. 2006.