1. Arshid, F. M., Connelly, R. F., Desai, J. N., Fulton, R. G., Giles, C. H. &Kefalas, J. C. (1954). A study of certain natural dyes II. The structure of the metallic lakes of the Brazilwood and Logwood colouring matters.J. Soc. Dyers Col. 70, 402?12.
2. Baker, J. R. (1958).Principles of Biological Microtechnique. pp. 174&190. London: Methuen.
3. Baker, J. R. (1962). Experiments on the action of mordants. 2: Aluminium-haematein:Quart. J. micr. Sci. 103, 493?517.
4. Bentley, K. W. (1960).The Natural Pigments. New York: Interscience Publishers.
5. Brand, J. C. D. &Dglinton, G. (1964).Applications of Spectroscopy of Organic Chemistry, London: Oldbourne Press.