Dyfyniad APA

Clemens, J. (2000). Evaluating vaccine safety before and after licensure. World Health Organization.

Dyfyniad Arddull Chicago

Clemens, J. Evaluating Vaccine Safety Before and After Licensure. World Health Organization, 2000.

Dyfyniad MLA

Clemens, J. Evaluating Vaccine Safety Before and After Licensure. World Health Organization, 2000.

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