- Woodward Hydro Product History. 6.
- Woodward mechanical governor history letter, circa 1965.
- Woodward mechanical governor history letter, page 2.
- Woodward selects the Stevens Point, Wisconsin location for new factory, circa 1981.
- Woodward shop order 1289, circa march 12, 1907.
- Woodward Shop Order 3444, circa March 26, 1919.
- Woodward Water Wheel Governor Catalogue. Page 8.