Cita APA (7th ed.)

Heinrich, C., & Friese, P. (2000). Sery C: Himmelschwere.

Cita Chicago (17th ed.)

Heinrich, Claudia, i Peter Friese. Sery C: Himmelschwere. Essen, 2000.

Cita MLA (8th ed.)

Heinrich, Claudia, i Peter Friese. Sery C: Himmelschwere. 2000.