GENERAL
- LESLIE STEPHEN.
- History of English Thought in the Eighteenth Century. 1876. Vol. II, Chapters IX and X.
- W.E.H. LECKY.
- History of England in the Eighteenth Century.
- A.L. SMITH.
- Political Philosophy in England in the Seventeenth and Eighteenth Centuries in the Cambridge Modern History. Vol. VI, Chapter XXIII.
- J. BONAR.
- Philosophy and Political Economy. Chapters V-IX.
- F.W. MAITLAND.
- An Historical Sketch of Liberty and Equality in Collected Papers. Vol. I.