APA (7th ed.) Citation

Roggen, B. (1978). Der Schlüssel zum Schlüssel. Bauer.

Chicago Style (17th ed.) Citation

Roggen, Beat. Der Schlüssel Zum Schlüssel. Zürich: Bauer, 1978.

MLA (9th ed.) Citation

Roggen, Beat. Der Schlüssel Zum Schlüssel. Bauer, 1978.

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