- AstroImagers (by Bruce Waddington)
- Adkins, Larry
- AmirArjomand, Reza (AstroSpot)
- Aslan, Leon (SoCalAstro)
- Bobchin, Craig (Astronomy4You)
- Buchheim, Bob (Altimira Observatory)
- Butler, Chris
- Eubanks, Stephen (Advanced Telescope Systems)
- Harris, Joel (Twilight Tours)
- Kodama, Dave
- Pacholka, Wally (Bright Night Gallery)
- Rosner, Arnie (Rent-a-Scope)
- Stann, Ray (Ray's Universe)
- Stember, Richard (Bellcroft Observatory)
- Stoker, Pat (Nightsky Journeys)
- AmSky Astronomy Clubs' Newsletters
- Astronomy Outreach Network
- Chapman University (Orange, California) The host of OCA general meetings
- Griffith Observatory (Los Angeles, California)
- Mount Wilson Observatory (Pasadena, California)
- Optical Society of Southern California
- Tessmann Planetarium
- Tzec Maun Foundation Internet telescopes for students
- What's Up? (Chris butler)
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