1. Barnes, A., & Burnes, D. (1993). A nation in denial. Boulder, CO: Westview Press.
2. Blid, M., & Gerdner, A. (2006). Socially excluding housing support to homeless substance misusers: two Swedish case studies of special category housing. International Journal of Social Welfare, 15(2), 162–179.
3. Børner Stax, T. (2003). Estimating the use of illegal drugs among homeless people using shelters in denmark. Substance Use & Misuse, 38(3–6), 443–462.
4. Busch-Geertsema, V. (2001). Wohnungslosenpolitik in anderen EU-Ländern. Übertragbarkeit von Konzepten und Maßnahmen auf Deutschland. Studieim Auftrag des Bundesministeriums für Verkehr, Bau und Wohnungswesenvertreten durch das Bundesamt für Bauwesen und Raumordnung [Policies for tackling homelessness in other EU countries—Transferability of concepts and measures to the German situation; Study on behalf of the German Federal Ministry of Transport, Building, and Housing represented by the Federal Office for Building and Regional Planning]. Bielefeld: Germany, Verlag Soziale Hilfe.
5. Cameron, A., & Lart, R. (2003). Factors promoting and obstacles hindering joint working: A systematic review of the research evidence. Journal of Integrated Care, 11(2), 9–17.