APA (7th ed.) Citation

Klöcker, A., & Deurs, W. v. (1908). Sommerfugle. Gad.

Chicago Style (17th ed.) Citation

Klöcker, A., and Wilhelm van Deurs. Sommerfugle. København: Gad, 1908.

MLA (9th ed.) Citation

Klöcker, A., and Wilhelm van Deurs. Sommerfugle. Gad, 1908.

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