Great Britain. Prime Minister & Great Britain. Public Record Office. (1972). Operational correspondence and papers. Public Record Office.
Lua i Stíl Chicago (17ú heag.)Great Britain. Prime Minister agus Great Britain. Public Record Office. Operational Correspondence and Papers. London: Public Record Office, 1972.
Lua MLA (8ú heag.)Great Britain. Prime Minister agus Great Britain. Public Record Office. Operational Correspondence and Papers. Public Record Office, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.