APA Edition Citation

Ehlrich, . A. H., Ehrilich, P. R., & Holdren, J. P. (1977). Ecoscience population resources environment. W . H Freeman and Company.

Chicago Edition Citation

Ehlrich, A H., P R. Ehrilich, and J P. Holdren. Ecoscience Population Resources Environment. Sanfrancisco: W . H Freeman and Company, 1977.

MLA Edition Citation

Ehlrich, A H., et al. Ecoscience Population Resources Environment. W . H Freeman and Company, 1977.