UK National Archives. HW 50/11. 1 June 1941 – 10 February 1945. Dossier on Russian Liaison. Notes on Sigint cooperation with the Russians during World War II (Crankshaw's mission to Moscow).
UK National Archives. HW 61/37. July 1942. Appointment and terms of reference for Lieutenant Colonel Crankshaw, representative of the Y services in Russia attached to No. 30 Mission Moscow.