Giù la maschera. Come riconoscere le emozioni dall'espressione del visoWallace V. Friesen, Paul Ekman · First published 2007Open the Tome
Emotion in the human face: guide-lines for research and an integration of findingsPaul Ekman, Wallace V. Friesen, Phoebe Ellsworth, Arnold P. Goldstein, Leonard Krasner · First published 1972Open the Tome
