Cita APA (7th ed.)

Ackermann, P., Krimmel, B., & Krimmel, E. (1980). Peter Ackermann.

Cita Chicago (17th ed.)

Ackermann, Peter, Bernd Krimmel, i Elisabeth Krimmel. Peter Ackermann. Darmstadt, 1980.

Cita MLA (8th ed.)

Ackermann, Peter, et al. Peter Ackermann. 1980.