Monitoring the Future. National results on adolescent drug use. Johnston, L., O'Malley, P., Bachman, J., & Schulenberg, J. 2011.
bibtex   
@Misc{marijuana,
author = {L.D. Johnston and P.M. O'Malley and J.G. Bachman and J.E. Schulenberg},
year = {2011},
title = {Monitoring the {Future}. {N}ational results on adolescent drug use.}
}

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