Costello, M. A. (1989). Levels of living and their geographic context: Northern Mindanao, 1960-1980. Population/Development Planning and Research Project.
芝加哥风格引文Costello, Michael A. Levels of Living and Their Geographic Context: Northern Mindanao, 1960-1980. [Makati, Metro Manila]: Population/Development Planning and Research Project, 1989.
MLA引文Costello, Michael A. Levels of Living and Their Geographic Context: Northern Mindanao, 1960-1980. Population/Development Planning and Research Project, 1989.
警告：这些引文格式不一定是100％准确.