APA (7th ed.) Citation

Ekman, P. (1972). Emotion in the human face: Guide-lines for research and an integration of findings. Pergamon Press.

Chicago Style (17th ed.) Citation

Ekman, Paul. Emotion in the Human Face: Guide-lines for Research and an Integration of Findings. New York: Pergamon Press, 1972.

MLA (9th ed.) Citation

Ekman, Paul. Emotion in the Human Face: Guide-lines for Research and an Integration of Findings. Pergamon Press, 1972.