APA (7th ed.) Citation

Claus, G., & Fisch, B. Sportliches Wandern.

Chicago Style (17th ed.) Citation

Claus, Gerhard, and Bernhard Fisch. Sportliches Wandern.

MLA (8th ed.) Citation

Claus, Gerhard, and Bernhard Fisch. Sportliches Wandern.

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