Citazione Stile APA (7a Edizione)

Ekman, P., & Friesen, W. V. (1978). Facial action coding system. Investigator's guide: Paul Ekman ; Wallace V. Friesen. Consulting Psychologists Pr..

Citazione stile Chigago Style (17a edizione)

Ekman, Paul, e Wallace V. Friesen. Facial Action Coding System. Investigator's Guide: Paul Ekman ; Wallace V. Friesen. Palo Alto, Calif.: Consulting Psychologists Pr., 1978.

Citatione MLA (8a ed.)

Ekman, Paul, e Wallace V. Friesen. Facial Action Coding System. Investigator's Guide: Paul Ekman ; Wallace V. Friesen. Consulting Psychologists Pr., 1978.