Eugenics Society (London, England), Benjamin, B., Cox, P. R., & Peel, J. (1973). Resources and population: Proceedings of the ninth annual symposium of the Eugenics Society, London, 1972. New York Academic Press.

Eugenics Society (London, England), Bernard Benjamin, Peter R. Cox, and John Peel. Resources and Population: Proceedings of the Ninth Annual Symposium of the Eugenics Society, London, 1972. London: New York Academic Press, 1973.

Eugenics Society (London, England), et al. Resources and Population: Proceedings of the Ninth Annual Symposium of the Eugenics Society, London, 1972. New York Academic Press, 1973.