Hackenberg, R. A. The poverty explosion: Population growth and income in Davao City, 1972. Philippine planning journal.
Lua i Stíl Chicago (17ú heag.)Hackenberg, Robert A. "The Poverty Explosion: Population Growth and Income in Davao City, 1972." Philippine Planning Journal .
Lua MLA (9ú heag.)Hackenberg, Robert A. "The Poverty Explosion: Population Growth and Income in Davao City, 1972." Philippine Planning Journal, .
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