Cita APA (7th ed.)

Kreibohm, J. (2007). Christian Helwing: 4M. Rasch.

Cita Chicago (17th ed.)

Kreibohm, Joachim. Christian Helwing: 4M. Bramsche: Rasch, 2007.

Cita MLA (8th ed.)

Kreibohm, Joachim. Christian Helwing: 4M. Rasch, 2007.