एपीए उद्धरण

Robert C Beck. (1990). Motivation: Theories and principles. PHI.

शिकागो स्टाइल उद्धरण

Robert C Beck. Motivation: Theories and Principles. New Jersey: PHI, 1990.

एमएलए उद्धरण

Robert C Beck. Motivation: Theories and Principles. PHI, 1990.