World Health Organization. (2011). Psychological first aid: Guide for field workers. World Health Organization.
Citazione stile Chigago Style (17a edizione)World Health Organization. Psychological First Aid: Guide for Field Workers. Geneva, Switzerland: World Health Organization, 2011.
Citatione MLA (8a ed.)World Health Organization. Psychological First Aid: Guide for Field Workers. World Health Organization, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.