Darwin, C.
(1998). The expression of the emotions in man and animals. London: HarperCollins. (Original publication 1872)
2.
Ekman, P.
(1976) Movements with precise meaning. Journal of Communication, 26(3), 14-26.
3.
Ekman, P.
(1992a). Facial expression of emotion: New findings, new questions. Psychological Science, 3, 34-38.
4.
Ekman, P.
(1992b). Telling lies: Clues to deceit in the marketplace, marriage, and politics (2nd ed.). New York: Norton.
5.
Ekman, P.
(1993). Facial expression of emotion. American Psychologist, 48, 384-392.
6.
Ekman, P.
, & Friesen, W. V. (1969). Nonverbal leakage and clues to deception. Psychiatry, 32, 88-105.
7.
Ekman, P.
, & Friesen, W. V. (1972). Hand movements. Journal of Communication, 22, 353-374.
8.
Haggard, E. A.
, & Isaacs, K. S. (1966). Micro-momentary facial expressions as indicators of ego mechanisms in psychotherapy. In L. A. Gottschalk & A. H. Auerback (Eds.), Methods of research in psychotherapy. New York: Appleton-Century-Crofts.
