Gaya APA

Swanson, C, P., Wittig, A, F. (1981). Theory and problems of psychology of learning . New York: New York: Schaums Outline; 1981.

Gaya MLA

Swanson, Carl, P.., Wittig, Arno, F.. "Theory and problems of psychology of learning". New York: New York: Schaums Outline; 1981, 1981. Text.