Report on the family and political correspondence of William Spencer Cavendish, 6th Duke of Devonshire 1811-39 in the Devonshire Collections, Chatsworth, Bakewell, Derbyshire.
Great Britain.Royal Commission on Historical Manuscripts.
Great Britain.National Register of Archives.
[London?] : [Royal Commission on Historical Manuscripts : National Register of Archives],
1977.
"No. 77/20."