Associations
- American Watchmakers-Clockmakers Institute (AWCI)
- The Antiquarian Horological Society
- The British Horological Institute (BHI)
- The National Association of Watch and Clock Collectors, Inc. (NAWCC)
- The International Society of Antique Scale Collectors (ISASC)
General Sites
- Directorate of Time, U.S. Naval Observatory
- Historical Clock and Watch Research
- The Horological Foundation
- Horology – The Index
- The Long Now Foundation
- Montres Passion
- NIST “Official US Time”
- ThePuristS.com