World Health Organization. (2011). Psychological first aid: Guide for field workers. World Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. Psychological First Aid: Guide for Field Workers. Geneva, Switzerland: World Health Organization, 2011.
MLA-referens (8:e uppl.)World Health Organization. Psychological First Aid: Guide for Field Workers. World Health Organization, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.