Williams, R. T. (1948). The relation of optical form to biological activity in the amino-acid series: A symposium held at University College Hospital Medical School, London, on 15 February 1947. Cambridge: University Press.

Williams, Richard Tecwyn. The Relation of Optical Form to Biological Activity in the Amino-acid Series: A Symposium Held At University College Hospital Medical School, London, On 15 February 1947. Cambridge: University Press, 1948.

Williams, Richard Tecwyn. The Relation of Optical Form to Biological Activity in the Amino-acid Series: A Symposium Held At University College Hospital Medical School, London, On 15 February 1947. Cambridge: University Press, 1948.