Ruch, F. L. (1959). Psychology and life (5th. ed.). Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Ruch, Floyd L. Psychology and Life. 5th. ed. Scott, Foresman, 1959.
Lua MLA (9ú heag.)Ruch, Floyd L. Psychology and Life. 5th. ed. Scott, Foresman, 1959.
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