APA-referens (7:e uppl.)

Birdsall, N. (1993). Population growth, externalities, and poverty. Policy Research Department and Eastern African Department, World Bank.

Chicago-referens (17:e uppl.)

Birdsall, Nancy. Population Growth, Externalities, and Poverty. Washington, D.C: Policy Research Department and Eastern African Department, World Bank, 1993.

MLA-referens (9:e uppl.)

Birdsall, Nancy. Population Growth, Externalities, and Poverty. Policy Research Department and Eastern African Department, World Bank, 1993.