APA (7th ed.) Citation

Vopel, K. W. Interaktionsspiele. Isko-Press.

Chicago Style (17th ed.) Citation

Vopel, Klaus W. Interaktionsspiele. Hamburg: Isko-Press.

MLA (9th ed.) Citation

Vopel, Klaus W. Interaktionsspiele. Isko-Press.

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