Gaya APA

Wittig, A, F. (1981). Schaum's outline of theory and problems of psychology of learning / Arno F. Wittig . New York: McGraw-Hill book company.

Gaya MLA

Wittig, Arno, F.. "Schaum's outline of theory and problems of psychology of learning / Arno F. Wittig". New York: McGraw-Hill book company, 1981. Skripsi.