APA (7th ed.) Citation

American Psychological Association, Ogilvie, R. D., & Harsh, J. R. (1994). Sleep onset: Normal and abnormal processes. American Psychological Association.

Chicago Style (17th ed.) Citation

American Psychological Association, Robert D. Ogilvie, and John R. Harsh. Sleep Onset: Normal and Abnormal Processes. Washington: American Psychological Association, 1994.

MLA (9th ed.) Citation

American Psychological Association, et al. Sleep Onset: Normal and Abnormal Processes. American Psychological Association, 1994.