Παραπομπή σε μορφή APA (7η εκδ.)

Costello, M. A. (1989). Levels of living and their geographic context: Northern Mindanao, 1960-1980. Population/Development Planning and Research Project.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Costello, Michael A. Levels of Living and Their Geographic Context: Northern Mindanao, 1960-1980. [Makati, Metro Manila]: Population/Development Planning and Research Project, 1989.

Παραπομπή σε μορφή MLA (9th εκδ.)

Costello, Michael A. Levels of Living and Their Geographic Context: Northern Mindanao, 1960-1980. Population/Development Planning and Research Project, 1989.