APA (7th ed.) Citation

Piccard, G. (1979). Wasserzeichen Schlüssel. Kohlhammer.

Chicago Style (17th ed.) Citation

Piccard, Gerhard. Wasserzeichen Schlüssel. Stuttgart: Kohlhammer, 1979.

MLA (9th ed.) Citation

Piccard, Gerhard. Wasserzeichen Schlüssel. Kohlhammer, 1979.

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