www.search-institute.org/assets/

www.drugabuse.gov/prevention/risk.html

www.nida.nih.gov/NIDA_Notes/NNVol16N6/Risk.html

www.oas.samhsa.gov/NHSDA/NAC97/Table_of_Contents.htm

ncfy.acf.hhs.gov/publications/ydfactsh.htm