APA (7th ed.) Citation

Great Britain. Foreign Office & National Archives (Great Britain). (1906). Foreign Office, political departments, general correspondence from 1906-1966: FO 371. The National Archives.

Chicago Style (17th ed.) Citation

Great Britain. Foreign Office and National Archives (Great Britain). Foreign Office, Political Departments, General Correspondence from 1906-1966: FO 371. Kew [England]: The National Archives, 1906.

MLA (9th ed.) Citation

Great Britain. Foreign Office and National Archives (Great Britain). Foreign Office, Political Departments, General Correspondence from 1906-1966: FO 371. The National Archives, 1906.