Dyfyniad APA

World Health Organization. (2011). The fourth ten years of the World Health Organization 1978-1987. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. The Fourth Ten Years of the World Health Organization 1978-1987. Geneva: World Health Organization, 2011.

Dyfyniad MLA

World Health Organization. The Fourth Ten Years of the World Health Organization 1978-1987. World Health Organization, 2011.

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