The original document was found in: Public Record Office, Kew, England, HW 16/23, building GPDD 355a distributed on 15 January 1943, radio-telegrams n. 12 and 13/15, transmitted on 11 January 1943.
 L'originale del documento si trova in: Public Record Office, Kew, England, HW 16/23, decodifica GPDD 355a distribuito il 15 gennaio 1943, radio-telegrammi n. 12 e 13/15, trasmessi l'11 gennaio 1943.