HAGEMANN GISELA. (1994). THE MOTIVATION MANUAL. MULTI-TECH PUBLICATIONS CO.
Cita Chicago (17th ed.)HAGEMANN GISELA. THE MOTIVATION MANUAL. MUMBAI: MULTI-TECH PUBLICATIONS CO, 1994.
Cita MLA (9th ed.)HAGEMANN GISELA. THE MOTIVATION MANUAL. MULTI-TECH PUBLICATIONS CO, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.