APA Citation

Pressman, M. R., & Orr, W. C. (1997). Understanding sleep: The evaluation and treatment of sleep disorders. Washington, DC: American Psychological Association.

MLA Citation

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

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