The following books and websites contain additional information, activities, and enrichment options.
- Solid, Liquid or Gas?
- Sally Hewitt, Children's Press, 1998
- Solids, Liquids, Gases
- Charnan Simon, Compass Point Books, 2000
- What Is the World Made Of? All About Solids, Liquids, and Gases
- Kathleen Weidner Zoehfeld, HarperTrophy, 1998