APA

Lewy A. J., Emens J. S., Songer J. B., Sims N., Laurie A. L., Fiala S. C. & Buti A. L. (2009). Winter Depression: Integrating mood, circadian rhythms, and the sleep/wake and light/dark cycles into a bio-psycho-social-environmental model. : Sleep medicine clinics.

Chicago

Lewy Alfred J, Emens Jonathan S, Songer Jeannie B, Sims Neelam, Laurie Amber L, Fiala Steven C and Buti Allie L. 2009. Winter Depression: Integrating mood, circadian rhythms, and the sleep/wake and light/dark cycles into a bio-psycho-social-environmental model. : Sleep medicine clinics.

Harvard

Lewy A. J., Emens J. S., Songer J. B., Sims N., Laurie A. L., Fiala S. C. and Buti A. L. (2009). Winter Depression: Integrating mood, circadian rhythms, and the sleep/wake and light/dark cycles into a bio-psycho-social-environmental model. : Sleep medicine clinics.

MLA

Lewy Alfred J, Emens Jonathan S, Songer Jeannie B, Sims Neelam, Laurie Amber L, Fiala Steven C and Buti Allie L. Winter Depression: Integrating mood, circadian rhythms, and the sleep/wake and light/dark cycles into a bio-psycho-social-environmental model. : Sleep medicine clinics. 2009.