WHO. (1990). WHO drug information; Vol.4(N.4)/1990. Geneva: WHO.
Trích dẫn kiểu ChicagoWHO. WHO Drug Information; Vol.4(N.4)/1990. Geneva: WHO, 1990.
MLA引文WHO. WHO Drug Information; Vol.4(N.4)/1990. Geneva: WHO, 1990.
警告：這些引文格式不一定是100％准確.
APA引文