Birdsall, N. (1993). Population growth, externalities, and poverty. Policy Research Department and Eastern African Department, World Bank.
Lua i Stíl Chicago (17ú heag.)Birdsall, Nancy. Population Growth, Externalities, and Poverty. Washington, D.C: Policy Research Department and Eastern African Department, World Bank, 1993.
Lua MLA (9ú heag.)Birdsall, Nancy. Population Growth, Externalities, and Poverty. Policy Research Department and Eastern African Department, World Bank, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.