1. Derk-Jan, D., M. E. Dale. “Circadian and Homeostatic Control of Wakefulness and Sleep. En: F. W. Turek, P. C. Zee, editores. Regulation of Sleep and Circadian Rhythms. Nueva York: Marcel Decker Inc., 1999, pp. 111-147.

2. Kryger, M. H., T. Roth, W. C. Demment. Principles and
Practice of Sleep Medicine. 4a edición. Philadelphia, PA: Elsevier Saunders, 2005.

3. Torre-Bouscoulet, L, J. C. Vázquez-García, A. Muiño, M. Márquez, M. V. López, M. M. de Oca, C. Talamo, G. Valdivia, J. Pertuze, A. M. Menezes, R. Pérez-Padilla; PLATINO Group. “Prevalence of Sleep Related Symptoms in Four Latin American Cities”. J Clin Sleep Med. 15, 4, dic. (2008):79-85.

4. Zee, P. C., Turek. “Introduction to Sleep and Circadian
Rhythms. En: F. W. Turek, P. C. Zee, editores. Regulation of Sleep and Circadian Rhythms. Nueva York: Marcel Decker Inc., 1999, pp. 1-17.