APA

National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, Hinrichs N. & Council on Population and Environment. (1971). Population, environment, and people. New York: McGraw-Hill.

Chicago

National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, Hinrichs Noël and Council on Population and Environment. 1971. Population, environment, and people. New York: McGraw-Hill.

Harvard

National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, Hinrichs N. and Council on Population and Environment. (1971). Population, environment, and people. New York: McGraw-Hill.

MLA

National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, National Congress on Optimum Population and Environment, Hinrichs Noël and Council on Population and Environment. Population, environment, and people. New York: McGraw-Hill. 1971.