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Krech David, Crutchfield Richard S, . (1969). Elements of psychology. New York, USA: Alfred A. Knopf.
Krech David, Crutchfield Richard S, . 1969. Elements of psychology. New York, USA: Alfred A. Knopf.
Krech David, Crutchfield Richard S, . Elements of psychology. New York, USA: Alfred A. Knopf. 1969.
