1. V. du Vigneaud, A Trail of Research in Sulfur Chemistry and Metabolism and Related Fields, Cornell University Press, Ithaca (1952).
2. C. Fromageot, in The Harvey Lectures, Vol. 49, pp. 1–36, Academic Press, New York (1955).
3. J. A. Stekol, in A Symposium on Amino Acid Metabolism (W. D. McElroy and H. B. Glass, eds.), pp. 509–557, The Johns Hopkins Press, Baltimore (1955).
4. T. P. Singer and E. B. Kearney, in A Symposium on Amino Acid Metabolism (W. D. McElroy and H. B. Glass, eds.), pp. 558–590, The Johns Hopkins Press, Baltimore (1955).
5. L. Young and G. A. Maw, The Metabolism of Sulphur Compounds, Methuen, London (1958).