Παραπομπή APA

Campbell, B. (1977). Birds of coast and sea: Britain and North Europe. Oxford University.

Παραπομπή Chicago Style

Campbell, Bruce. Birds of Coast and Sea: Britain and North Europe. Toronto: Oxford University, 1977.

Παραπομπή MLA

Campbell, Bruce. Birds of Coast and Sea: Britain and North Europe. Oxford University, 1977.