OMS. (1981). World health statistics quarterly; Vol.34, N.2,3,4/1981: Rapport trimestriel de statistiques sanitaires mondiales; Vol.34, N.2,3,4/1981. Geneva: OMS.
Trích dẫn kiểu ChicagoOMS. World Health Statistics Quarterly; Vol.34, N.2,3,4/1981: Rapport Trimestriel De Statistiques Sanitaires Mondiales; Vol.34, N.2,3,4/1981. Geneva: OMS, 1981.
Deismireacht MLAOMS. World Health Statistics Quarterly; Vol.34, N.2,3,4/1981: Rapport Trimestriel De Statistiques Sanitaires Mondiales; Vol.34, N.2,3,4/1981. Geneva: OMS, 1981.
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