EHRLICH, P. R., EHRLICH, A. H., & HOLDREN, J. P. (1973). Human ecology: Problems and solutions. W.H. Freeman.
芝加哥风格引文EHRLICH, Paul R., Anne H. EHRLICH, 与 John P. HOLDREN. Human Ecology: Problems and Solutions. San Francisco: W.H. Freeman, 1973.
MLA引文EHRLICH, Paul R., et al. Human Ecology: Problems and Solutions. W.H. Freeman, 1973.
警告：这些引文格式不一定是100％准确.