HatfieldE.WalsterG. W.PiliavinJ. A.Equity theory and helping relationships. In WispeL. (Ed.), Altruism, sympathy, and helping. New York: Academic Press, 1978. Pp. 115–139.
2.
SavitskyJ. C.SimM. E.Trading emotions: Equity theory of reward and punishment. Journal of Communication, 1974, 24, 140–146.
