Hewitt, Sally. Solid, Liquid, or Gas?. Danbury: Children's Press, 1998.

Matter. 20 Jan. 2005 www.brainpop.com/science/matter.statesofmatter/

Patten, J.M. Liquid to Gas and Back. Vero Beach: The Rourke Book Co.,                Inc., 1995.

Patten, J.M. Matter Really Matters. Vero Beach: The Rourke Book Co., Inc., 1995.

Patten, J.M. Solids, Liquids, and Gases. Vero Beach: The Rourke Book Co., Inc., 1995.

States of Matter. 20 Feb. 2005 <www.chem4kids.com/file/matter_states>.