APA (7th ed.) Citation

Clarke, T., Orgill, C., & Disley, T. (2006). Field guide to the birds of the Atlantic islands. Christopher Helm.

Chicago Style (17th ed.) Citation

Clarke, Tony, Chris Orgill, and Tony Disley. Field Guide to the Birds of the Atlantic Islands. London: Christopher Helm, 2006.

MLA (9th ed.) Citation

Clarke, Tony, et al. Field Guide to the Birds of the Atlantic Islands. Christopher Helm, 2006.