4Howard Schott, "Harpsichord to Piano - Transition", Robert Palmieri. Encyclopedia of Keyboard Instruments, 2nd ed. (New York. Routledge, 2003 ), p.166.
10"Carl Philipp Emanuel Bach (1714-1788)Sonatas and Sonatinas from Essay on the true art of playingkeyboard instruments, 1753. Christopher Hogwood, Clavi-chord-Johann Adolf Hass 1761".