1. Legislative Counsel Office of the California State Legislature. Business and Professions Code, Section 4140–4149. Available at: http://www.leginfo.ca.gov/cgi-bin/waisgate? WAISdocID=53519425183+0+0+0&WAISaction=retrieve . Accessed on: December 26, 2008.
2. Legislative Counsel Office of the California State Legislature. Health and Safety Code, Section 11364–11376. Available at: http://www.leginfo.ca.gov/cgi-bin/waisgate? WAISdocID=53537126350+0+0+0&WAISaction=retrieve . Accessed on: December 26, 2008.
3. California State Senate website. Available at: http://info.sen.ca.gov/pub/03-04/bill/sen/sb_1151-1200/sb_1159_bill_20040920_chaptered.html . Accessed on: December 28, 2008.
4. Rose V, Backes G, Martinez AN, McFarland W. Non-prescription syringe sales in California: a qualitative examination of practices among 12 local health jurisdictions. J Urban Health. 2010. doi: 10.1007/s11524-010-9445-5 .
5. Patton MQ. Qualitative research and evaluation methods. 3rd ed. Thousand Oaks: Sage; 2002.