The official websites of Steinway & Sons, http://www.steinway.com/ and Steinway Musical Instruments, http://steinwaymusical.com/

The diary of William Steinway (transcribed by Edwin M. Good), 1861 – 1896, Smithsonian Institution, http://americanhistory.si.edu/steinwaydiary/

LaGuardia and Wagner Archives, LaGuardia Community College, City University of New York, 31-10 Thomson Ave., Room E-238, Long Island City, NY 11101, http://www.steinway.lagcc.cuny.edu/COLLECTIONS.aspx

New York Times Article Archive, http://www.nytimes.com/ref/membercenter/nytarchive.html

Music Trade Review Online Library, http://mtr.arcade-museum.com/

United States Patents and Trademarks Office, 600 Dulany Street, Alexandria, VA 22314, http://patft.uspto.gov/

Google Patents Search, http://www.google.com/?tbm=pts

New York Passenger Arrival Records, 1820 – 1957, http://www.archives.gov/northeast/nyc/finding-aids/passenger-lists.html

“The Story of the Steinways”, by Elbert Hubbard (1921)

“People and Pianos, a Century of Service to Music“, by Theodore E. Steinway (1953)

“The Piano: A History”, by Cyril Ehrlich (1976)

“Steinway“, by Ronald V. Ratcliffe (1989)

“The Steinway Saga“, by Donald W. Fostle (1995)

“88 Keys, the Making of a Steinway Piano“, by Miles Chapin (1997)

“Steinway & Sons“, by Richard K. Lieberman (1997)

“Piano, the Making of a Steinway Concert Grand“, by James Barron (2006)

Personal interviews with individuals associated with Steinway family and Steinway & Sons, and numerous additional documents and resources, available in libraries and online.