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Dyfyniad Arddull ChicagoWells, J. Elisabeth, et al. "Cross-National Comparisons of Sex Differences in Opportunities to Use Alcohol or Drugs, and the Transitions to Use." Subst Use Misuse 2011.
Dyfyniad MLAWells, J. Elisabeth, et al. "Cross-National Comparisons of Sex Differences in Opportunities to Use Alcohol or Drugs, and the Transitions to Use." Subst Use Misuse 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.