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Keyboard performer John Khouri shows his early keyboard instruments in his basement at home in Vallejo, Calif., on Wednesday, August 5, 2015. (Liz Hafalia/San Francisco Chronicle via AP Stock Photo - Alamy
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Early Keyboard Instruments: Benton Fletcher Collection at Fenton House: 9780707803531: Waitzman, Mimi S., Charlston, Terence R. - Amazon.com
The Piano: The Pianofortes of Bartolomeo Cristofori (1655–1731) | Essay | The Metropolitan Museum of Art | Heilbrunn Timeline of Art History
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