Ismail، M. A. R. (1972). Efeects of simultaneous and sequential presentation methods upon acquisition in reversal and nonreversal shift learning situations (رسالة ماجستير غير منشورة). University of Wisconsin–Madison، ماديسون. مسترجع من http://search.mandumah.com/Record/615140
Ismail، Mohamad Abd Rahman. "Efeects of Simultaneous and Sequential Presentation Methods Upon Acquisition in Reversal and Nonreversal Shift Learning Situations" رسالة ماجستير. University of Wisconsin–Madison، ماديسون، 1972. مسترجع من http://search.mandumah.com/Record/615140