1. National Alliance to End Homelessness. The State of Homelessness in America 2013; 2013.
2. Burt M, Aron L, Douglas T, et al. Homelessness: Programs and the people they serve. Washington, DC: United States Department of Housing and Urban Development; 1999.
3. Dietz TL. Predictors of reported current and lifetime substance abuse problems among a national sample of U.S. homeless. Substance Use & Misuse 2007;42(11):1745–1766.
4. National Alliance to End Homelessness. Snapshot of Homelessness. National Alliance to End Homelessness, Wichita
5. Austin J, McKellar JD, Moos R. The influence of co-occurring axis I disorders on treatment utilization and outcome in homeless patients with substance use disorders. Addictive Behaviors 2011;36(9):941–944.