Cita APA (7a ed.)

Clapp, J. D., & Early, T. J. (1999). A qualitative exploratory study of substance abuse prevention outcomes in a heterogeneous prevention system. Journal of drug education, 29(3), 217-233.

Cita Chicago Style (17a ed.)

Clapp, John D., y Theresa J. Early. "A Qualitative Exploratory Study of Substance Abuse Prevention Outcomes in a Heterogeneous Prevention System." Journal of Drug Education 29, no. 3 (1999): 217-233.

Cita MLA (8a ed.)

Clapp, John D., y Theresa J. Early. "A Qualitative Exploratory Study of Substance Abuse Prevention Outcomes in a Heterogeneous Prevention System." Journal of Drug Education, vol. 29, no. 3, 1999, pp. 217-233.