Cita APA (7a ed.)

Steinhardt, M. A., & Dishman, R. K. (1989). Reliability and validity of expected aoutcomes and barriers for habitual physical activity. [s.n.].

Cita Chicago Style (17a ed.)

Steinhardt, Mary A., y Rod K. Dishman. Reliability and Validity of Expected Aoutcomes and Barriers for Habitual Physical Activity. [S.l.]: [s.n.], 1989.

Cita MLA (9a ed.)

Steinhardt, Mary A., y Rod K. Dishman. Reliability and Validity of Expected Aoutcomes and Barriers for Habitual Physical Activity. [s.n.], 1989.