1. F. D. Snell and C. T. Snell, “Colorimetric Methods of Analysis,” Vol. II, D. Van Nostrand Company, Inc., New York, 1949, pp. 808–819.
2. R. Y. Stranier, E. A. Adelberg, and J. L. Ingraham, “The Microbial World,” 4th ed., Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1976, pp. 27–35.
3. J. B. Walker, in “Cyclitols and Phosphoinositides,” ed. by W. Wells and F. Eisenberg, Jr., Academic Press, New York and London, 1978, pp. 423–438.