Halkitis, P. N., Siconolfi, D. E., Stults, C. B., Barton, S., Bub, K., & Kapadia, F. (2014). Modeling substance use in emerging adult gay, bisexual, and other YMSM across time: The P18 cohort study. Drug Alcohol Depend.

Halkitis, Perry N., Daniel E. Siconolfi, Christopher B. Stults, Staci Barton, Kristen Bub, ja Farzana Kapadia. "Modeling Substance Use in Emerging Adult Gay, Bisexual, and Other YMSM Across Time: The P18 Cohort Study." Drug Alcohol Depend 2014.

Halkitis, Perry N., et al. "Modeling Substance Use in Emerging Adult Gay, Bisexual, and Other YMSM Across Time: The P18 Cohort Study." Drug Alcohol Depend 2014.