World population beyond six billion /
by Alene Gelbard, Carl Haub, and Mary M. Kent

APA Citation

Gelbard, A., Kent, M. Mederios., Haub, C., Population Reference Bureau. (1999). World population beyond six billion. Washington, D.C.: Population Reference Bureau.

MLA Citation

Gelbard, Alene, Mary Mederios Kent, Carl Haub, and Population Reference Bureau. World Population Beyond Six Billion. Washington, D.C.: Population Reference Bureau, 1999.

Warning: These citations may not always be complete (especially for serials).