Brigham Young University Variable Star Database
- Currently contains 311 stars which have been classified as Delta Scutis or Gamma Doradus in some published source.
- http://astronomy.byu.edu/research.php?section=vardatinstructions

The Minima of Algol
- An article by Alan MacRobert from Sky and Telescope Magazine about the star Algol (Beta Persei) was the first eclipsing variable star ever discovered.
- http://skytonight.com/observing/objects/variablestars/3304096.html?page=1&c=y

The Top Twelve Naked-Eye Variable Stars
- An article by John Isles from Sky and Telescope Magazine.
- http://skytonight.com/observing/objects/variablestars/3304276.html?page=1&c=y

Skyandtelescope.com - Variable Stars
- Observing variable stars.
- http://skytonight.com/observing/objects/variablestars/

A Ritzian Interpretation of Variable Stars
- A study on the nature of the speed of light in space using light curves and spectroscopic observations of variable stars as evidence.
- http://www.datasync.com/~rsf1/binaries.htm

The Cepheid Distance Scale: A History
- A critical review of the Cepheid distance scale, from its inception, to the Hipparcos mission and beyond.
- http://institute-of-brilliant-failures.com/index.htm

Astronomical Society of South Australia
- ASSA's variable star group. News, FAQ, charts, and software.
- http://www.assa.org.au/sig/variables/

Astronomy On-Line
- Collaborative Project aimed at getting new people involved in variable star observing.
- http://www.eso.org/outreach/spec-prog/aol/market/collaboration/varstar/

Information Bulletin on Variable Stars
- The IBVS is a bulletin of Commissions 27 and 42 of the International Astronomical Union, published by Konkoly Observatory, Budapest, Hungary.
- http://www.konkoly.hu/IBVS/IBVS.html

General Catalog of Variable Stars Research Group
- Research group working on the GCVS, Sternberg Astronomical Institute, Moscow, Russia. Includes catalogs and publications.
- http://www.sai.msu.su/groups/cluster/gcvs/

American Association of Variable Star Observers
- The largest organization for variable stars: provides professional and amateur collaboration, research, and analysis of variable star observations.
- http://www.aavso.org/