1. James Chadwick, “Possible Existence of a Neutron,” Nature, 129(1932), 312
2. James Chadwick, “The Existence of a Neutron,” Proc. Roy. Soc, A 136(1932), 692–708
3. Robert T. Beyer (ed.), Foundations of Nuclear Physics(New York: Dover, 1949), pp. 5–21.
4. Norman Feather, “The Experimental Discovery of the Neutron,” Proceedings of the Tenth International Congress of History of Science[1962], Vol. I (Paris: Hermann, 1964), pp. 135–144; “Chadwick’s Neutron,” Contemp. Phys, 15(1974), 565–572.
5. Edward M. Purcell, “Nuclear Physics without the Neutron; Clues and Contradictions,” Proc. Tenth Inter. Cong. Hist. Sci, Vol. I, pp. 121–132.