APA aipamena

(1972). guide to the natural world and index to the Life nature Library. Time-Life Books.

Chicago Style aipamena

Guide to the Natural World and Index to the Life Nature Library. New York: Time-Life Books, 1972.

MLA aipamena

Guide to the Natural World and Index to the Life Nature Library. Time-Life Books, 1972.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.