APA (7th ed.) Citation

König, K., Weick, F., & Wink, M. (2008). Owls of the world (2nd ed.). Christopher Helm.

Chicago Style (17th ed.) Citation

König, Klaus, Friedhelm Weick, and Michael Wink. Owls of the World. 2nd ed. London: Christopher Helm, 2008.

MLA (9th ed.) Citation

König, Klaus, et al. Owls of the World. 2nd ed. Christopher Helm, 2008.