Paperweight Collectors' Association, Inc.
- PCA is a nonprofit organization of more than 1600 members worldwide. Membership includes artists, dealers, collectors, museums, and libraries. Members range from those owning one or two inexpensive paperweights to those with large and valuable collections
- http://paperweight.org/index.html

Caithness Glass Paperweights Information - World Collectors Net
- Caithness Glass Paperweights Collectors Society.
- http://www.worldcollectorsnet.com/caithness/index.html