APA (7th ed.) Citation

Andrews, C. M., & Spignesi, S. J. (2003). Crop circles: Signs of contact. New Page Books.

Chicago Style (17th ed.) Citation

Andrews, Colin M., and Stephen J. Spignesi. Crop Circles: Signs of Contact. Franklin Lakes, N.J.: New Page Books, 2003.

MLA (9th ed.) Citation

Andrews, Colin M., and Stephen J. Spignesi. Crop Circles: Signs of Contact. New Page Books, 2003.