Wik, Reynold M. Benjamin Holt and Caterpillar: Tracks and Combines. Amer Society of Agricultural, 1985.
Swinford, Norm. Allis-Chalmers Construction Machinery & Industrial Equipment (Crestline). Motorbooks International, 1998.
Wikipedia. The Free Encyclopedia. Caterpillar track. 18 Mar. 2005. 20 Mar. 2005 <http://en.wikipedia.org/wiki/Caterpillar_track>.
Wikipedia. The Free Encyclopedia. Christie suspension. 26 Feb. 2005. 20 Mar. 2005 <http://en.wikipedia.org/wiki/Christie_suspension>.
Wikipedia. The Free Encyclopedia. Benjamin Holt. 17 Jan 2005. 20 Mar. 2005 <http://en.wikipedia.org/wiki/Benjamin_Holt>.
Harris, Tom. How M1 Tanks Work. 20 Mar. 2005 <http://science.howstuffworks.com/m1-tank1.htm>.
Abrams Battle Tank photograph used on the front and “bibliography” pages is taken from Radstone Embedded Computing web-site. Used for educational purposes only.
D6R Series II tractor photograph used on the “basics” and “people” pages is taken from ThomasNet Industrial News Room web-site. Used for educational purposes only.
Steam Tractor photograph used on the “history” page is taken from Kings County Library web-site. Used for educational purposes only.
