APA (7th ed.) Citation

Pressman, M. R., & Orr, W. C. (1997). Understanding sleep : the evaluation and treatment of sleep disorders / edited by Mark R. Pressman, William C. Orr: The evaluation and treatment of sleep disorders. American Psychological Association.

Chicago Style (17th ed.) Citation

Pressman, Mark R., and William C. Orr. Understanding Sleep : The Evaluation and Treatment of Sleep Disorders / Edited by Mark R. Pressman, William C. Orr: The Evaluation and Treatment of Sleep Disorders. Washington, D.C.: American Psychological Association, 1997.

MLA (9th ed.) Citation

Pressman, Mark R., and William C. Orr. Understanding Sleep : The Evaluation and Treatment of Sleep Disorders / Edited by Mark R. Pressman, William C. Orr: The Evaluation and Treatment of Sleep Disorders. American Psychological Association, 1997.

Warning: These citations may not always be 100% accurate.