^Geoff Kennedy, Diggers, levellers, and agrarian capitalism: Radical political thought in seventeenth century England (Lexington Books, 2008) pp. 122–140, 153–163. 183–192 online
^A. J. Taylor, "Progress and Poverty in Britain, 1780–1850: A Reappraisal." History 45.153 (1960): 16-31 online.