Cita APA (7a ed.)

Terry, C. E., & Pellens, M. (1970). The opium problem Patterson Smith reprint series in criminology, law enforcement, and social problems.

Cita Chicago Style (17a ed.)

Terry, Charles E., y Mildred Pellens. "The Opium Problem." Patterson Smith Reprint Series in Criminology, Law Enforcement, and Social Problems 1970.

Cita MLA (8a ed.)

Terry, Charles E., y Mildred Pellens. "The Opium Problem." Patterson Smith Reprint Series in Criminology, Law Enforcement, and Social Problems, 1970.