Great Britain. Prime Minister & Great Britain. Public Record Office. (1972). Operational correspondence and papers. Public Record Office.
Chicago-referens (17:e uppl.)Great Britain. Prime Minister och Great Britain. Public Record Office. Operational Correspondence and Papers. London: Public Record Office, 1972.
MLA-referens (8:e uppl.)Great Britain. Prime Minister och Great Britain. Public Record Office. Operational Correspondence and Papers. Public Record Office, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.