Hackenberg, R. A. (1973). A developing city in a dual economy: Economic and demographic trends in Davao City, Philippines, 1972. Davao Action Information Center.
Lua i Stíl Chicago (17ú heag.)Hackenberg, Robert A. A Developing City in a Dual Economy: Economic and Demographic Trends in Davao City, Philippines, 1972. Davao City: Davao Action Information Center, 1973.
Lua MLA (9ú heag.)Hackenberg, Robert A. A Developing City in a Dual Economy: Economic and Demographic Trends in Davao City, Philippines, 1972. Davao Action Information Center, 1973.
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