APA (7th ed.) Citation

D'Adamo, P. J., & Whitney, C. (2001). Eat right 4 your type. Century Books Limited.

Chicago Style (17th ed.) Citation

D'Adamo, Peter J., and Catherine Whitney. Eat Right 4 Your Type. London: Century Books Limited, 2001.

MLA (9th ed.) Citation

D'Adamo, Peter J., and Catherine Whitney. Eat Right 4 Your Type. Century Books Limited, 2001.