Παραπομπή APA
Varela, J. A. (1971). Psychological solutions to social problems: An introduction to social technology. New York: Academic Press.
Παραπομπή Chicago StyleVarela, Jacobo A. Psychological Solutions to Social Problems: An Introduction to Social Technology. New York: Academic Press, 1971.
Παραπομπή MLAVarela, Jacobo A. Psychological Solutions to Social Problems: An Introduction to Social Technology. New York: Academic Press, 1971.
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