Tolong jelaskan mengenai Sumber primer dari Robert Gascoyne-Cecil, Marquess Salisbury III

Paul Smith (ed.), Lord Salisbury on Politics. A Selection from His Articles in the Quarterly Review, 1860–83 (Cambridge University Press, 1972).

John Vincent (ed.), A Selection from the Diaries of Edward Henry Stanley, 15th Earl of Derby (1826–93) between September 1869 and March 1878 (London: The Royal Historical Society, 1994).

R. H. Williams (ed.), Salisbury–Balfour Correspondence: Letters Exchanged between the Third Marquess of Salisbury and his nephew Arthur James Balfour, 1869–1892 (1988).

Harold Temperley, and Lillian M. Penson, eds; Foundations of British Foreign Policy from Pitt (1792) to Salisbury (1902); Or, Documents, Old and New (1938) online edition

Robert Cecil Salisbury. Essays by the Late Marquess of Salisbury (1905) online