World Health Organization. (2011). Psychological first aid: Guide for field workers. World Health Organization.
Цитирование в стиле Чикаго (17-е изд.)World Health Organization. Psychological First Aid: Guide for Field Workers. Geneva, Switzerland: World Health Organization, 2011.
Цитирование MLA (8-е изд.)World Health Organization. Psychological First Aid: Guide for Field Workers. World Health Organization, 2011.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.