Hackenberg, R. A. (1973). The poverty explosion: Population increase and income decline in Davao City. [s.n.].
Chicago-referens (17:e uppl.)Hackenberg, Robert A. The Poverty Explosion: Population Increase and Income Decline in Davao City. Davao City: [s.n.], 1973.
MLA-referens (9:e uppl.)Hackenberg, Robert A. The Poverty Explosion: Population Increase and Income Decline in Davao City. [s.n.], 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.