1. The Coal Industry in the Eighteenth Century;Ashton,1964
2. The King's Servants;Aylmer,1961
3. Two Tracts by Gregory King;Barnett,1936
4. Observations on the Produce of the Income Tax …, A New and Corrected Edition;Beeke,1800
5. Working Hours in British Industry: An Economic History;Bienefeld,1972