(1) Richard J. Cox, "Servants at Northampton Forge, Baltimore County, Maryland," National Genealogical Society Quarterly, Vol. 63 (1975): 110-117.
(2) Charles G. Steffen, "The Pre-Industrial Iron Worker: Northampton Iron Works, 1780-1820," Labor History, Vol. 20, No. 1 (1979): 89-110, citing Furnace Workmen's Book 1772-1774, B-28, Northampton Furnace, Ridgely Account Books (Maryland Historical Society, Baltimore).