APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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