• Anders, E., Organic compounds in meteorites, Science, 182, 781790, 1973.
  • Berra, Y., apocryphal, ca. 1948.
  • Claus, G., and B. Nagy, A microbiological examination of some carbonaceous chondrites, Nature, 192, 594596, 1961.
  • Cooper, H. S. F., The search for life on Mars, 254, Holt Rinehart Winston, New York, 1980.
  • Crowe, M. J., The extraterrestrial life debate, 1750–1900, 680, Cambridge Univ. Press, New York, 1986.
  • Horowitz, N., To Utopia and back: The search for life in the solar system, 168, W. H. Freeman, New York, 1986.
  • Levin, G., A reappraisal of life on Mars, The NASA Mars Conference, Science and Technology Series, 71Reiber, D. B., 174, Am. Astronaut. Soc., San Diego, Calif., 1988.
  • McKay, D. S., E. K. Gibson Jr., K. L. Thomas-Keprta, H. Vali, C. S. Romanek, S. J. Clemett, X. D. FChillier, C. R. Maechling, and R. N. Zare, Search for past life on Mars: Possible relic biogenic activity in martian meteorite ALH84001, Science, 273, 924930, 1996.
  • Washburn, M., Mars at last, 278, Putnam, New York, 1977.
  • Wilford, J. N., Mars beckons, 244, Knopf, New York, 1990.