1. ‘The Chemical Works of Caspar Neumann’, 2nd Edn, 1773, Vol. I, p, 408 (London: J. F. Rivington & Co.)
2. Chem. & Ind., 1958, p. 486
3. ‘Growth and Maturity of Peas for Canning and Freezing’, 1958 (Uppsala: Almquist & Wikselle Boktryckeri A.-B.)
4. quoted by , ‘A History of Food Adulteration and Analysis’, 1934 (London: George Allen & Unwin, Ltd.)