| 其他書名 | Prepared for the Office of Health, Bureau for Research and Development, U.S. Agency for International Development, Under WASH Task No. 027 |
| 出版 | Water and Sanitation for Health Project, 1992 |
| URL | http://books.google.com.hk/books?id=sJjezQEACAAJ&hl=&source=gbs_api |