Schweizer Armbanduhren. Chronologie eines Welterfolges. By Brunner, Gisbert L. and Christian Pfeiffer-Belli.
Technique and History of the Swiss Watch. By Eugene Jaquet and Alfred Chapuis.
The History of Clocks & Watches. By Eric Bruton.
The Pocket Watch Handbook. By M. Cutmore.
Britten's Old Clocks and Watches and Their Makers, Eighth Edition
Wear. Fritting.