I drew on a number of sources for historical information and images for the Valjoux Reference Site. They are listed here to cite the sources of my information and give credit for the images.

A Brief History of the Automatic Chronograph by Christoph Ozdoba. May 10, 1998 and August 13, 2005.

From  Ebauches SA to ETA SA: 75 Years of Swiss Movements translated from the French alt.horology thread by Claude Girardin (IHC Life Member) and posted March 6, 2005.

Rohwerke und ihre Fabrikanten (Folge 1) by Gisbert L. Brunner January 1998.

Valjoux Chronographen: Aus dem Tal der Tuftler by Gisbert L. Brunner, 1998.

History of ETA 1793-2002  ETA SA Manufacture Horlogerie Suisse, CH-2540 Grenchen, PDF file.

A Man of Record Profile of Edmond Capt by Lucien F. Trueb, Watch Time magazine, August 2003.