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引文WHO. WHO Drug Information; Vol.5(N.3)/1991. Geneva: WHO, 1991.
警告：这些引文格式不一定是100％准确.
APA引文