Dyfyniad APA

World Health Organization. (2011). Psychological first aid: Guide for field workers. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. Psychological First Aid: Guide for Field Workers. Geneva, Switzerland: World Health Organization, 2011.

Dyfyniad MLA

World Health Organization. Psychological First Aid: Guide for Field Workers. World Health Organization, 2011.

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