WHO. International digest of health legislation: Vol.42(1)/1991. Geneva: WHO.
Trích dẫn kiểu ChicagoWHO. International Digest of Health Legislation: Vol.42(1)/1991. Geneva: WHO.
MLA引文WHO. International Digest of Health Legislation: Vol.42(1)/1991. Geneva: WHO.
警告：這些引文格式不一定是100％准確.