Cita APA (7th ed.)

Espie, C., Lindsay, W., Brooks, D., Hood, E., & Turvey, T. (1989). A controlled comparative investigation of psychological treatments for chronic sleep-onset insomnia.

Cita Chicago (17th ed.)

Espie, C., W. Lindsay, D. Brooks, E. Hood, i T. Turvey. A Controlled Comparative Investigation of Psychological Treatments for Chronic Sleep-onset Insomnia. 1989.

Cita MLA (9th ed.)

Espie, C., et al. A Controlled Comparative Investigation of Psychological Treatments for Chronic Sleep-onset Insomnia. 1989.