APA (7th ed.) Citation

Ehrlich, P. R., & Ehrlich, A. H. Population, Resources, Environment: Issues In Human Ecology.

Chicago Style (17th ed.) Citation

Ehrlich, Paul R., and Anne H. Ehrlich. Population, Resources, Environment: Issues In Human Ecology.

MLA (9th ed.) Citation

Ehrlich, Paul R., and Anne H. Ehrlich. Population, Resources, Environment: Issues In Human Ecology.

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