Zarco, R. M. (1975). Two research monographs on drug abuse in the Philippines. Government Printing Office.
Chicago-referens (17:e uppl.)Zarco, Ricardo M. Two Research Monographs on Drug Abuse in the Philippines. Manila: Government Printing Office, 1975.
MLA-referens (9:e uppl.)Zarco, Ricardo M. Two Research Monographs on Drug Abuse in the Philippines. Government Printing Office, 1975.
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