WHO. (1991). WHO drug information; Vol.5(N.3)/1991. Geneva: WHO.
Trích dẫn kiểu ChicagoWHO. WHO Drug Information; Vol.5(N.3)/1991. Geneva: WHO, 1991.
MLA CitationWHO. WHO Drug Information; Vol.5(N.3)/1991. Geneva: WHO, 1991.
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