(en) history ot the pianola - piano players, www.pianola.org, consulté le 07/09/2009 [lire en ligne] - Mark Sommer, The day the music died. QRS has ended production of player-piano roll, Buffalo News, 15/08/2009 consulté le 7/09/2009 [lire en ligne]
pianola.org
(en) history ot the pianola - piano players, www.pianola.org, consulté le 07/09/2009 [lire en ligne] - Mark Sommer, The day the music died. QRS has ended production of player-piano roll, Buffalo News, 15/08/2009 consulté le 7/09/2009 [lire en ligne]
welte-mignon.de
(en) US-Patent 287.599, Emil Welte, New York, 30. October 1883 [lire en ligne]