Williams, J. (2001). Alcohol and marijuana among college students: Economic complements or substitutesn. National Bureau of Economic Research.
Citace podle Chicago (17th ed.)Williams, Jenny. Alcohol and Marijuana Among College Students: Economic Complements or Substitutesn. Cambridge: National Bureau of Economic Research, 2001.
Citace podle MLA (9th ed.)Williams, Jenny. Alcohol and Marijuana Among College Students: Economic Complements or Substitutesn. National Bureau of Economic Research, 2001.
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