APA (7th ed.) Citation

Ekman, P., Friesen, W. V., & Ellsworth, P. (1972). Emotion in the human face: Guidelines for research and an integration of findings. Pergamon.

Chicago Style (17th ed.) Citation

Ekman, Paul, Wallace V. Friesen, and Phoebe Ellsworth. Emotion in the Human Face: Guidelines for Research and an Integration of Findings. New York [etc.]: Pergamon, 1972.

MLA (9th ed.) Citation

Ekman, Paul, et al. Emotion in the Human Face: Guidelines for Research and an Integration of Findings. Pergamon, 1972.