Astilla, E. C. (1980). Population and development problems in upland Southwestern Cebu province, Philippines: An integrated assessment from three research projects of the Area Research and Training Center, University of San Carlos, Cebu City. University of San Carlos.
Lua i Stíl Chicago (17ú heag.)Astilla, Estela C. Population and Development Problems in Upland Southwestern Cebu Province, Philippines: An Integrated Assessment from Three Research Projects of the Area Research and Training Center, University of San Carlos, Cebu City. Cebu City: University of San Carlos, 1980.
Lua MLA (9ú heag.)Astilla, Estela C. Population and Development Problems in Upland Southwestern Cebu Province, Philippines: An Integrated Assessment from Three Research Projects of the Area Research and Training Center, University of San Carlos, Cebu City. University of San Carlos, 1980.