APA (7th ed.) Citation

Steinlen, T. (1922). "War against war!". Series of 3 copies in english, french and german.

Chicago Style (17th ed.) Citation

Steinlen, Théophile-Alexandre. "War Against War!". Series of 3 Copies in English, French and German. 1922.

MLA (8th ed.) Citation

Steinlen, Théophile-Alexandre. "War Against War!". Series of 3 Copies in English, French and German. 1922.

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