World Health Organization. (2011). Psychological first aid: Guide for field workers. World Health Organization.
芝加哥风格引文World Health Organization. Psychological First Aid: Guide for Field Workers. Geneva, Switzerland: World Health Organization, 2011.
MLA引文World Health Organization. Psychological First Aid: Guide for Field Workers. World Health Organization, 2011.
警告：这些引文格式不一定是100％准确.