APA (7th ed.) Citation

Olsen, K. M., & Larsson, H. (2004). Gulls of North America, Europe, and Asia. Princeton University Press.

Chicago Style (17th ed.) Citation

Olsen, Klaus Malling, and Hans Larsson. Gulls of North America, Europe, and Asia. Princeton, N.J.: Princeton University Press, 2004.

MLA (9th ed.) Citation

Olsen, Klaus Malling, and Hans Larsson. Gulls of North America, Europe, and Asia. Princeton University Press, 2004.