Cars: An Environmental Challenge, Terri Willis & Wallace Black, 1992 Childrens Press.
Managing Toxic Wastes, Michael Kronenwetter, The Westport Publishing Group, 1989.
The air we breathe., Enid Bloom, Double Day & Company Inc. New York 1971.
Simple Science Experiments With Everyday Materials, Muriel Mandell, Sterling Publishing Co. Inc., New York, 1990.
Caring For Our Air, Carol Greene, Enslow Publisher Inc., 1991.
