from new and original material /
including a manuscript diary by Georgiana, duchess of Devonshire.
Sichel, W. Sydney., Devonshire, G. Spencer Cavendish. (1909). Sheridan: from new and original material. London: Constable.
Sichel, Walter Sydney, 1855-1933, and Georgiana Spencer Cavendish Devonshire. Sheridan: From New And Original Material. London: Constable, 1909.
Warning: These citations may not always be complete (especially for serials).