APA (7th ed.) Citation

Ekman, P., & Davidson, R. J. (1994). The nature of emotion: Fundamental questions. Oxford University Press.

Chicago Style (17th ed.) Citation

Ekman, Paul, and Richard J. Davidson. The Nature of Emotion: Fundamental Questions. New York [etc.]: Oxford University Press, 1994.

MLA (9th ed.) Citation

Ekman, Paul, and Richard J. Davidson. The Nature of Emotion: Fundamental Questions. Oxford University Press, 1994.