1. Centennial campaign;Gray,1976
2. John Gibbon and his heart-lung machine;Romaine-Davis,1991
3. Gallear M. Guns at the Little Bighorn. Available at: http://www.westernerspublications.ltd.uk/CAGB%20Guns%Guns%20at%20the%20LBH.htm. Accessed March 9, 2005.
4. The contract surgeon;Wengert;J West,1997