APA citiranje

OMS. (1991). Bulletin of WHO: Vol.69(4)/1991. Genève: OMS.

Trích dẫn kiểu Chicago

OMS. Bulletin of WHO: Vol.69(4)/1991. Genève: OMS, 1991.

MLA citiranje

OMS. Bulletin of WHO: Vol.69(4)/1991. Genève: OMS, 1991.