Great Britain. Colonial Office & Great Britain. Public Record Office. Colonial Office and predecessors. Public Record Office.
Chicago Style (17th ed.) CitationGreat Britain. Colonial Office and Great Britain. Public Record Office. Colonial Office and Predecessors. London: Public Record Office.
MLA (8th ed.) CitationGreat Britain. Colonial Office and Great Britain. Public Record Office. Colonial Office and Predecessors. Public Record Office.
Warning: These citations may not always be 100% accurate.