1. Audsley GA (1965) The art of organ building. Dover Publications Inc., New York.
http://www.organstops.org/h/Hohlflote3.gif
. Accessed on 18 Aug 2015
2. Bonavia–Hunt NA (1947) The modern British organ. A. Weekes & Co., London
3. Bush DE, Kassel R (eds) (2006) The organ: an encyclopedia. Routledge/Taylor & Francis Group, New York
4. Cavaille—Coll 1895 cited by Feneer 1999
5. Fenner D (1999) Cavaillé—Coll and the French romantic tradition. Yale University Press, New Haven