http://www.steinway.com
The official website of Steinway & Sons

Fostle, D.W. The Steinway Saga: An American Dynasty. New York: Scribner, 1995.
A look at the lives of the Steinway family and the world in which they lived

Steinway, Theodore, E. People and Pianos: A Century of Service to Music. 2nd ed., New York: Steinway & Sons, 1961.
Mostly pictures relating to the Steinway company's history