OMS. (1991). Bulletin of WHO: Vol.69(6)/1991. Geneva: OMS.
Trích dẫn kiểu ChicagoOMS. Bulletin of WHO: Vol.69(6)/1991. Geneva: OMS, 1991.
MLA CitationOMS. Bulletin of WHO: Vol.69(6)/1991. Geneva: OMS, 1991.
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