1. Biosphere 2: The Human Experiment;Allen,1991
2. Allen, J., Alling, A. The design approach for Mars on Earth®, a biospheric closed system testing facility for long-term space habitation. American Institute of Aeronautics and Astronautics Inc. IAC-02-IAA.8.2.02, 2002.
3. The legacy of Biosphere 2 for the study of biospherics and closed ecological systems;Allen;Advances in Space Research,2003
4. Life Under Glass: The Inside Story of Biosphere 2;Alling,1993
5. A summary of the Biosphere 2 test module research, appendix chapter;Alling,1993