APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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