- Doc Brown's Chemistry Clinic: The Halogens - Includes an overview, general properties, reactivity trends, and information about the industrial electrolysis of sodium chloride solution.
- The Chemistry of the Halogens - Covers their properties, methods of preparation, general trends, the hydrogen halides, and oxyacids of the halogens and their salts.
- Visual Elements: The Halogens - Overview, general properties, and chemical data for the group.