George Washington (1834). "Official letters relating to the French war, and private letters before the American revolution". The Writings of George Washington. Vol. II. Boston: Russell, Ordione, and Metcalf, and Hilliard, Grey and Co. p. 370. Retrieved July 31, 2010.
"Mount Airy Mansion". Maryland Department of Natural Resources. Retrieved January 13, 2020.
mncppcapps.org
Saleh Van Erem, Architectural Historian (January 2008). "Duvall Barn Complex"(PDF). Inventory of Historic Properties Form. Maryland Historical Trust. Retrieved February 3, 2016.