APA (7th ed.) Citation

Harris, M. P. (1982). A field guide to the birds of Galapagos (Rev. ed.). Collins.

Chicago Style (17th ed.) Citation

Harris, Michael P. A Field Guide to the Birds of Galapagos. Rev. ed. London: Collins, 1982.

MLA (8th ed.) Citation

Harris, Michael P. A Field Guide to the Birds of Galapagos. Rev. ed. Collins, 1982.