Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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