The Manuscripts of His Grace the Duke of Portland, preserved at Welbeck Abbey /
Historical Manuscripts Commission.
APA Citation
Oxford, R. Harley., Portland, W. John Arthur Charles James Cavendish-Bentinck. (1891). The Manuscripts of His Grace the Duke of Portland, preserved at Welbeck Abbey. London: HMSO.
MLA Citation
Oxford, Robert Harley, Earl of, 1661-1724, and William John Arthur Charles James Cavendish-Bentinck Portland. The Manuscripts of His Grace the Duke of Portland, Preserved At Welbeck Abbey. London: HMSO, 1891.
Warning: These citations may not always be complete (especially for serials).