APA (7th ed.) Citation

Ahrens, C., & Seyfarth, L. (2010). Frank Gerritz: Invitionals, auctions.

Chicago Style (17th ed.) Citation

Ahrens, Carsten, and Ludwig Seyfarth. Frank Gerritz: Invitionals, Auctions. Bremen, 2010.

MLA (8th ed.) Citation

Ahrens, Carsten, and Ludwig Seyfarth. Frank Gerritz: Invitionals, Auctions. 2010.

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