APA (7th ed.) Citation

Great Britain. Foreign Office & Great Britain. Public Record Office. Confidential print (numerical series). Public Record Office.

Chicago Style (17th ed.) Citation

Great Britain. Foreign Office and Great Britain. Public Record Office. Confidential Print (numerical Series). London: Public Record Office.

MLA (8th ed.) Citation

Great Britain. Foreign Office and Great Britain. Public Record Office. Confidential Print (numerical Series). Public Record Office.

Warning: These citations may not always be 100% accurate.