APA (7th ed.) Citation

Forbis, W. H., & Time-Life Books. (1973). The Cowboys. Time-Life Books.

Chicago Style (17th ed.) Citation

Forbis, William H., and Time-Life Books. The Cowboys. Alexandria, Virginia: Time-Life Books, 1973.

MLA (9th ed.) Citation

Forbis, William H., and Time-Life Books. The Cowboys. Time-Life Books, 1973.