1. “Record of Indentures of Individuals Bound Out as Apprentices, Servants, etc. and of Germans and Other Redemptioners in the Office of the Mayor of the City of Philadelphia October 3, 1771, to October 5, 1773”. Manuscript held at the City Archives of Philadelphia.
2. “Book of Redemptioners, 1785–1804”. Manuscript held at the pennsylvania Historical Society, Philadelphia.
3. The ‘Egalitarian Ideal’ and the Distribution of Wealth in the Northern Agricultural Community: A Backward Look;Atack;Review of Economics and Statistics,1981
4. English Emigration on the Eve of the American Revolution;Campbell;American Historical Review,1955
5. The First Industrial Nation;Deane,1965