APA (7th ed.) Citation

Van den Berg, A. B., Van den Have, T., & Guido, K. (1997). Birdwatching: The ultimate guide to the birds of Europe. HarperCollins.

Chicago Style (17th ed.) Citation

Van den Berg, Arnoud B., Tom Van den Have, and Keijl Guido. Birdwatching: The Ultimate Guide to the Birds of Europe. London: HarperCollins, 1997.

MLA (9th ed.) Citation

Van den Berg, Arnoud B., et al. Birdwatching: The Ultimate Guide to the Birds of Europe. HarperCollins, 1997.