WHO. Female sterilization: A guide to provision of services. Geneva: WHO.
Trích dẫn kiểu ChicagoWHO. Female Sterilization: A Guide to Provision of Services. Geneva: WHO.
MLA引文WHO. Female Sterilization: A Guide to Provision of Services. Geneva: WHO.
警告：這些引文格式不一定是100％准確.