Cita APA (7a ed.)

Meyer, K. (1989). Petroleum - Jonny. Kinderbuchverlag.

Cita Chicago Style (17a ed.)

Meyer, Klaus. Petroleum - Jonny. Berlin: Kinderbuchverlag, 1989.

Cita MLA (8a ed.)

Meyer, Klaus. Petroleum - Jonny. Kinderbuchverlag, 1989.