References
- Isleib, Charles R., and Jack Chard (2002), The West Point Foundry and the Parrot Gun, Fleischmanns, NY: Purple Mountain Press.
- Lewis, Tom (2005), The Hudson: A History, New Haven: Yale University Press.
- Porter, Michael E. (1985), Competitive Advantage, New York: Free Press.
- Rinaldi, Thomas E., and Robert J. Yasinsac (2006), Hudson Valley Ruins, Hanover, NH: University Press of New England, 224-230.