APA (7th ed.) Citation

Cuno, S., & Weldin, F. (2015). Klopf! Klopf! Wer spielt mit? Ars Edition.

Chicago Style (17th ed.) Citation

Cuno, Sabine, and Frauke Weldin. Klopf! Klopf! Wer Spielt Mit? München: Ars Edition, 2015.

MLA (9th ed.) Citation

Cuno, Sabine, and Frauke Weldin. Klopf! Klopf! Wer Spielt Mit? Ars Edition, 2015.

Warning: These citations may not always be 100% accurate.