APA (7th ed.) Citation

Great Britain. Public Record Office & Great Britain. Cabinet Office. (1977). Cabinet Office class list. Swift Printers.

Chicago Style (17th ed.) Citation

Great Britain. Public Record Office and Great Britain. Cabinet Office. Cabinet Office Class List. London: Swift Printers, 1977.

MLA (8th ed.) Citation

Great Britain. Public Record Office and Great Britain. Cabinet Office. Cabinet Office Class List. Swift Printers, 1977.