Ryan, T. A. (1970). Intentional behavior: An approach to human motivation. Ronald Press.
Cita Chicago (17th ed.)Ryan, Thomas A. Intentional Behavior: An Approach to Human Motivation. New York: Ronald Press, 1970.
Cita MLA (9th ed.)Ryan, Thomas A. Intentional Behavior: An Approach to Human Motivation. Ronald Press, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.