APA aipamena

Peterson, R. T. (1941). A field guide to western birds. Houghton Mifflin.

Chicago Style aipamena

Peterson, Roger Tory. A Field Guide to Western Birds. Houghton Mifflin, 1941.

MLA aipamena

Peterson, Roger Tory. A Field Guide to Western Birds. Houghton Mifflin, 1941.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.