Sperling, A. P. (1957). Psychology made simple: A comprehensive course for ... Doubleday & Co..
Lua i Stíl Chicago (17ú heag.)Sperling, Abraham P. Psychology Made Simple: A Comprehensive Course for ... Garden City: Doubleday & Co., 1957.
Lua MLA (9ú heag.)Sperling, Abraham P. Psychology Made Simple: A Comprehensive Course for ... Doubleday & Co., 1957.
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