World Health Organization. (2011). Psychological first aid: Guide for field workers. World Health Organization.
Chicago-Zitierstil (17. Ausg.)World Health Organization. Psychological First Aid: Guide for Field Workers. Geneva, Switzerland: World Health Organization, 2011.
MLA-Zitierstil (8. Ausg.)World Health Organization. Psychological First Aid: Guide for Field Workers. World Health Organization, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.