1. P.W. Atkins, Physical Chemistry, 3rd ed (W. H. Freeman and Co., New York, 1986), p. 692
2. L. Pauling, General Chemistry (Dover Publications, New York, 1970), p. 566
3. J.E. Bailey, D.F. Ollis, Biochemical Engineering Fundamentals, 2nd edn. (McGraw-Hill Publishing Company, New York, 1986), pp. 473–476
4. M.L. Free, Bioleaching of a Sulfide Ore Concentrate - Distinguishing Between the Leaching Mechanisms of Attached and Nonattached Bacteria (M.S. Thesis, University of Utah, 1992)
5. S. Nagpal, T. Oolman, M.L. Free, B. Palmer, D.A. Dahlstrom, Biooxidation of a refractory pyrite-arsenopyrite-gold ore concentrate, in Mineral Bioprocessing, ed. by R.W. Smith, M. Misra (TMS, Warrendale, 1991), p. 469