APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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