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Jeremy Montagu, 'Instrument plans, books, postcards: Bate Collection, Oxford', FoMRHI Quarterly 68 (1992), p. 6-12: 10
Edwin M. Ripin, Denzil Wraight, G. Grant O'Brien, Howard Ferguson, John Caldwell, Howard Schott, William Dowd, 'Early keyboard instruments', The New Grove Musical Instruments Series, New York, London: Norton, 1989, p. 56
Grant O’Brian, 'The Numbering System of Ruckers Instruments', Brussels Museum of Musical Instruments Bulletin 4 (1974), p. 75-89: p. 84-85, 89, afb. 11