Clark 1961, p.9. Clark, Ronald W. (1961). The Birth of the Bomb: Britain's Part in the Weapon that Changed the World. London: Phoenix House. OCLC824335.
Clark 1961, p.5. Clark, Ronald W. (1961). The Birth of the Bomb: Britain's Part in the Weapon that Changed the World. London: Phoenix House. OCLC824335.
Clark 1961, p.11. Clark, Ronald W. (1961). The Birth of the Bomb: Britain's Part in the Weapon that Changed the World. London: Phoenix House. OCLC824335.
Clark 1961, pp.54–56. Clark, Ronald W. (1961). The Birth of the Bomb: Britain's Part in the Weapon that Changed the World. London: Phoenix House. OCLC824335.
Szasz 1992, pp.3–5. Szasz, Ferenc Morton (1992). British Scientists and the Manhattan Project: the Los Alamos Years. New York: St. Martin's Press. ISBN978-0-312-06167-8. OCLC23901666.
Phelps 2010, pp.282–283. Phelps, Stephen (2010). The Tizard Mission: the Top-Secret Operation that Changed the Course of World War II. Yardley, Pennsylvania: Westholme. ISBN978-1-59416-116-2. OCLC642846903.
Shrader 2006, p.14. Shrader, Charles R. (2006). History of Operations Research in the United States Army, Volume I: 1942–62. Washington, D.C.: US Army. ISBN978-0-16-072961-4. OCLC73821793.
Phelps 2010, pp.129–130. Phelps, Stephen (2010). The Tizard Mission: the Top-Secret Operation that Changed the Course of World War II. Yardley, Pennsylvania: Westholme. ISBN978-1-59416-116-2. OCLC642846903.
Botti 1987, pp.135–136. Botti, Timothy J. (1987). The Long Wait: the Forging of the Anglo-American Nuclear Alliance, 1945–58. Contributions in Military Studies. New York: Greenwood Press. ISBN978-0-313-25902-9. OCLC464084495.