↑ Haggbloom, S. J. et al. (2002). The 100 Most Eminent Psychologists of the 20th Century. Review of General Psychology. Vol. 6, No. 2, 139–15. Haggbloom and his team combined 3 quantitative variables: citations in professional journals, citations in textbooks, and nominations in a survey given to members of the Association for Psychological Science, with 3 qualitative variables (converted to quantitative scores): National Academy of Science (NAS) membership, American Psychological Association (APA) President and/or recipient of the APA Distinguished Scientific Contributions Award, and surname used as an eponym. Then the list was rank ordered. Ekman was #59.
↑ "Facial expression of emotion". In V.S. Ramachandran (Ed.), Encyclopedia of Human Behavior (Vol. 2, pp. 173–83). Oxford: Elsevier/Academic Press. ISBN978-008-088-575-9.
↑ No Authorship Indicated (tháng 4 năm 1992). “Paul Ekman”. American Psychologist. 47 (4): 470–71. doi:10.1037/0003-066x.47.4.470.