“Brandywine Creek at Chadds Ford Water Data.” River-Reports updated September 21, 2017. http://river-reports.com/state/pennsylvania/brandywine-creek-at-chadds-ford/
“Brandywine Creek at Wilmington Water Data.” River-Reports. updated September 21, 2017. http://river-reports.com/state/delaware/brandywine-creek-at-wilmington/
“Copy of an agreement between William Young and Caleb Kirk relating to mutual water rights, 1798” Box 3, DuPont allied business firms records (Accession LMSS:VI), Hagley Museum and Library, Wilmington, Delaware.
“Mill seats on the Brandywine River" Map, 1816, 20090603_waterwheelmap, Group 9, Series C, Map Drawer 5, The Longwood Manuscripts (Accession LMSS), Manuscripts and Archives Department, Hagley Museum and Library, Wilmington, DE 19807
Bassler, Margaret A. “The Story of William Young of Rockland.” Unpublished typescript. Delaware Historical Society, Wilmington.
Bidwell, John. American Paper Mills, 1690-1832. Hannover: Dartmouth College Press, 2013.
Gibson, George H. “Fullers, Carders, and Manufacturers of Woolen Goods in Delaware.” Delaware History 12, no. 1 (April 1966): 25-53.
Gibson, George H. “The Delaware Woolen Industry.” Delaware History 12, no. 2 (October 1966): 83-120.
William Young Papers, Delaware Historical Society, Wilmington.