- Author: Holdren John P., Ehrlich Paul R., Ehrlich Anne H
- Language: English
- Year: 1977
- Author: Paul R. Ehrlich, Anne H. Ehrlich
- Language: Spanish
- Author: Paul R. Ehrlich Anne H. Ehrlich John P. Holdren (auth.)
- Language: German
- Year: 1975
- Author: Paul R. Ehrlich Anne H. Ehrlich
- Language: English
- Year: 2004
- Author: Paul R. Ehrlich Anne H. Ehrlich
- Language: English
- Year: 1972
- Author: Paul R. Ehrlich Anne H. Ehrlich
- Language: English
- Year: 2004