Cita APA (7a ed.)

Barrett, B. S. (1999). An application of the transtheoretical model to physical activity. University Microfilms International.

Cita Chicago Style (17a ed.)

Barrett, Betsy Sue. An Application of the Transtheoretical Model to Physical Activity. Ann Arbor: University Microfilms International, 1999.

Cita MLA (9a ed.)

Barrett, Betsy Sue. An Application of the Transtheoretical Model to Physical Activity. University Microfilms International, 1999.