• Bernal, J. D. 1951. The physical basis of life. Routledge and Kegan Paul, London.
  • Denbigh, K. G. 1951. The thermodynamics of the steady state. Methuen and Co., London.
  • Evans, R. B. 1969. A proof that essergy is the only consistent measure of potential work. Ph.D. Thesis, Dartmouth College, University Microfilms, Ann Arbor, Michigan.
  • Hitchcock, D. R. & Lovelock, J. E. 1967. Life detection by atmospheric analysis. Icarus, 7, 149159.
  • Hutchinson, G. E. 1954. Biochemistry of the terrestrial atmosphere. In Chapter 8 of the Solar system (ed. Kuiper). University of Chicago Press, Chicago.
  • Junge, C. 1972. The cycle of atmospheric gases-natural and man made. Quart. J. R. Met. Soc., 98, 711729.
  • Lewis, G. N. & Randall, M. 1923. Thermodynamics and the free energy of chemical substrates, Chapter 39. McGraw Hill, New York.
  • Lovelock, J. E. 1972. Gaia as seen through the atmosphere. Atmospheric Environment, 6, 579580.
  • Lovelock, J. E. & Giffen, C. E. 1969. Planetary atmospheres: compositional and other changes associated with the presence of life, advanced space experiments (Ed. O. L.Tiffany and E.Zaiteff) pp. 179193. American Astronautical Soc., Washington, D.C.
  • Lovelock, J. E. & Lodge, J. P. 1972. Oxygen in the contemporary atmosphere. Atmospheric Environment, 6, 575578.
  • Margulis, L. & Lovelock, J. E. 1973. Biological modulation of the Earth's atmosphere. Icarus, in press.
  • Sagan, C. & Mullen, G. 1972. Earth and Mars: evolution of atmospheres and surface temperatures. Science, 177, 5256.
  • Schrodinger, E. 1944. What is Life? Cambridge University Press.
  • Shannon, C. E. & Weaver, W. 1963. The mathematical theory of communication. University of Illinois Press.
  • Sillén, L. G. 1966. Regulation of O2, N2, and CO2 in the atmosphere: thoughts of a laboratory chemist. Tellus, 18, 198206.
  • Tribus, M. & McIrvine, E. C. 1971. Energy and information. Scientific American, 224 No. 3, 179188.
  • Wigner, E. P. 1961. The logic of personal knowledge. Routledge and Kegan Paul, London.
  • Wofsy, S. C., McConnell, J. C. & McElroy, M. B. 1972. Atmospheric CH4, CO and CO2. J. Geophys. Res., 77, 44774493.
  • Ycas, M. 1972. Biological effects in the early atmosphere. Nature, 238, 163164.