APA (7th ed.) Citation

Great Britain. Colonial Office, Great Britain. War Office, & Great Britain. Public Record Office. (1970). Confidential print. Public Record Office.

Chicago Style (17th ed.) Citation

Great Britain. Colonial Office, Great Britain. War Office, and Great Britain. Public Record Office. Confidential Print. London: Public Record Office, 1970.

MLA (8th ed.) Citation

Great Britain. Colonial Office, et al. Confidential Print. Public Record Office, 1970.