OMS. (1991). Bulletin of WHO: Vol.69(4)/1991. Genève: OMS.
Trích dẫn kiểu ChicagoOMS. Bulletin of WHO: Vol.69(4)/1991. Genève: OMS, 1991.
MLA引文OMS. Bulletin of WHO: Vol.69(4)/1991. Genève: OMS, 1991.
警告：這些引文格式不一定是100％准確.
APA引文