Dyfyniad APA

World Health Organization. (2011). Manual for the laboratory diagnosis and virological surveillance of influenza. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. Manual for the Laboratory Diagnosis and Virological Surveillance of Influenza. Geneva, Switzerland: World Health Organization, 2011.

Dyfyniad MLA

World Health Organization. Manual for the Laboratory Diagnosis and Virological Surveillance of Influenza. World Health Organization, 2011.

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