Cita APA (7a ed.)

Richards, L. G., & Langer, J. H. (1972). Drug-taking in youth: An overview of social, psychological and educational aspects. U.S. Dept. of Justice.

Cita Chicago Style (17a ed.)

Richards, Louise G., y John H. Langer. Drug-taking in Youth: An Overview of Social, Psychological and Educational Aspects. Washington, D. C: U.S. Dept. of Justice, 1972.

Cita MLA (9a ed.)

Richards, Louise G., y John H. Langer. Drug-taking in Youth: An Overview of Social, Psychological and Educational Aspects. U.S. Dept. of Justice, 1972.