Dyfyniad APA

World Health Organization. (2009). Application of epidemiological principles for Public health action. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. Application of Epidemiological Principles for Public Health Action. New Delhi: World Health Organization, 2009.

Dyfyniad MLA

World Health Organization. Application of Epidemiological Principles for Public Health Action. World Health Organization, 2009.

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