"Clock Services and Repairs". Grandfather Clock Manufacturers and Antique Clock Repairs. Affordable Clocks. 2008. Archived from the original on 2009-05-22. Retrieved 2008-07-09.
"Calibre". Glossary of the Fondation de la Haute Horlogerie. Fondation de la Haute Horlogerie. 2012. Archived from the original on 2012-05-19. Retrieved 2012-01-22.
"Clock Services and Repairs". Grandfather Clock Manufacturers and Antique Clock Repairs. Affordable Clocks. 2008. Archived from the original on 2009-05-22. Retrieved 2008-07-09.
"Calibre". Glossary of the Fondation de la Haute Horlogerie. Fondation de la Haute Horlogerie. 2012. Archived from the original on 2012-05-19. Retrieved 2012-01-22.