USA Museums and Research facilities
The National Association of Watch And Clock Collectors
National Watch and Clock Museum
American Clock and Watch Museum
https://www.clockandwatchmuseum.org/
Hoffman Clock Museum
https://www.hoffmanclockmuseum.org/1/index.htm?
Halim Time and Glass Museum
Smithsonian Institution
Nawcc Research Library
https://www.nawcc.org/research/
NAWCC Bulletin Articles
June 1999, Vol., 41/3, Number 320
"The evolution of the Vienna Regulator" P293-314, Philip J. Rasch
June 2006, Vol., 48/3 Number 362
"Christian Huygens, the Pendulum, and the Cycloid" Alan Emmerson
April 2007, Vol., 49/2 Number 367
"The Clocks of Central Europe - Part Two" P150-162, Philip J. Rasch
Books and Publications
F.H. van Weijdom Claterbos, Viennese Clockmaker and What They Left Us, Interbook International B.V., 1979
Frederick Kaltenbock, Viennese Timpieces, Verlag, 1993
Rick Ortenberger, Vienna Regulators and Factory Clocks, Schiffer Publishing, Ltd., 1990.