Citazione Stile APA (7a Edizione)

Ekman, P. Duchenne and facial expression of emotion: Paul Ekman. The mechanism of human facial expression.(2003).

Citazione stile Chigago Style (17a edizione)

Ekman, Paul. "Duchenne and Facial Expression of Emotion: Paul Ekman." The Mechanism of Human Facial Expression.(2003) .

Citatione MLA (8a ed.)

Ekman, Paul. "Duchenne and Facial Expression of Emotion: Paul Ekman." The Mechanism of Human Facial Expression.(2003), .

Attenzione: Queste citazioni potrebbero non essere precise al 100%.