- CactiGuide.com
- Cactus and Succulent Plant Mall.com
- CandDPlants
- CoronaCactus Nursery LLC.
- Exotic Plant Books
- Fullerton Arboretum
- Gates Cactus and Succulent Society
- Gene Schroeder’s Images
- Long Beach Cactus Club
- San Gabriel Valley Cactus & Succulent Society
- South Coast Cactus and Succulent Society
- The Cactus & Succulent Society of America