@inbook{Ehrlich1972,
author = {Ehrlich, P. and Holdren, J.},
title= {Impact of population growth},
year = {1972},
editor = {Riker, R.G.},
booktitle = {Population, resources, and the environment},
address = {Washington DC},
publisher = {U.S. Government Printing Office},
pages = {365--377},
}