APA (7th ed.) Citation

(1991). Population, resources and the environment: The critical challenges. United Nations Population Fund.

Chicago Style (17th ed.) Citation

Population, Resources and the Environment: The Critical Challenges. New York: United Nations Population Fund, 1991.

MLA (9th ed.) Citation

Population, Resources and the Environment: The Critical Challenges. United Nations Population Fund, 1991.

Warning: These citations may not always be 100% accurate.