Boydell, Brian, 'Egan, John', in The New Grove Dictionary of Musical Instruments, ed. by Stanley Sadie, 3 vols (London: Macmillan Press Limited, 1984), I, p. 645

Egan, John | 1804–after 1841
Egan, Read & Taylor | c. 1820–1822
Subscribe to Boydell, Brian, 'Egan, John', in The New Grove Dictionary of Musical Instruments, ed. by Stanley Sadie, 3 vols (London: Macmillan Press Limited, 1984), I, p. 645