Willamson, R. C. (1982). Social psychology. F.E.Peacock.
Lua i Stíl Chicago (17ú heag.)Willamson, Robert C. Social Psychology. Illinois: F.E.Peacock, 1982.
Lua MLA (9ú heag.)Willamson, Robert C. Social Psychology. F.E.Peacock, 1982.
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