| 其他書名 | A Study of Migration Typology and Differentials, 1970 : UNFPA-NCSO Population Research Project |
| 出版 | Republic of the Philippines, National Economic and Development Authority, National Census and Statistics Office, 1977 |
| URL | http://books.google.com.hk/books?id=wK4EAAAAMAAJ&hl=&source=gbs_api |