(en) Nuclear reactor secrets revealed, BBC, : « The envelopes contain the work of two French scientists, Hans Von Halban and Lew Kowarski, who worked in the Cavendish laboratory in Cambridge. The documents detail experiments on nuclear fission, covering the components needed to make a nuclear reactor, how to create plutonium from uranium, and methods to stabilise nuclear chain reactions. »
(en) Zuoyue Wang et Lawrence Badash, Great lives from history : britsih and commonwealth series (ISBN978-0893565367, lire en ligne), « James Chadwick »
