Costello, M. A. (1989). Levels of living and their geographic context: Northern Mindanao, 1960-1980. Population/Development Planning and Research Project.
Lua i Stíl Chicago (17ú heag.)Costello, Michael A. Levels of Living and Their Geographic Context: Northern Mindanao, 1960-1980. [Makati, Metro Manila]: Population/Development Planning and Research Project, 1989.
Lua MLA (9ú heag.)Costello, Michael A. Levels of Living and Their Geographic Context: Northern Mindanao, 1960-1980. Population/Development Planning and Research Project, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.