Παραπομπή APA

LaFrance, M. (2013). Why smile ?: The science behind facial expressions. W.W. Nortan & Company.

Παραπομπή Chicago Style

LaFrance, Marrianne. Why Smile ?: The Science Behind Facial Expressions. New York: W.W. Nortan & Company, 2013.

Παραπομπή MLA

LaFrance, Marrianne. Why Smile ?: The Science Behind Facial Expressions. W.W. Nortan & Company, 2013.