HELLER ROBERT. (1998). MOTIVATING PEOPLE. DORLING KINDERSLEY.
Cita Chicago (17th ed.)HELLER ROBERT. MOTIVATING PEOPLE. LONDON: DORLING KINDERSLEY, 1998.
Cita MLA (9th ed.)HELLER ROBERT. MOTIVATING PEOPLE. DORLING KINDERSLEY, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.