Robert C. Beck. (2004). Motivation theories and principles - fifth edition. Usa: Pearson.
Chicago Style CitationRobert C. Beck. Motivation Theories and Principles - Fifth Edition. Usa: Pearson, 2004.
MLA CitationRobert C. Beck. Motivation Theories and Principles - Fifth Edition. Usa: Pearson, 2004.
Warning: These citations may not always be 100% accurate.