APA (7th ed.) Citation

Kükenthal, W., Helmcke, J., & Haltenorth, T. (1963). Handbuch der Zoologie. Gruyter.

Chicago Style (17th ed.) Citation

Kükenthal, Willy, J.-G Helmcke, and Th Haltenorth. Handbuch Der Zoologie. Berlin: Gruyter, 1963.

MLA (9th ed.) Citation

Kükenthal, Willy, et al. Handbuch Der Zoologie. Gruyter, 1963.