PlutchikR.Outlines of a new theory of emotion. Trans. N.Y. Acad. Sci., 1958, 20, 394–403.
2.
PlutchikR.The multifactor-analytic theory of emotion. J. Psychol., 1960, 50, 153–171.
3.
PlutchikR.A study of facial expression in the light of a new theory of emotion. Paper read at the 16th Int. Congr. Psychol., Bonn, Germany, August, 1960.