References

1. "The Best of Wonders Science: Elementary Science Activities." American Institute of Physics, Delmar Publishers: Albany, 1997.
2. "Teaching Physics with TOYS: Activities for Grades K-9." Taylor, Poth, & Portman, Terrific Science Press: Middletown, 1995.
3. "SOUND: Science Projects." Simon de Pinna, Raintree Steck-Vaughn Publishers: Austin, 1998.
4. "How Science Works." Judith Hann, Dorling Kindersley Limited: London, 1991.
5. "SOUND: Science Activities." Graham Peacock, Wayland Publishers, Ltd., 1993.
6. "Sound Fundamentals." Robert W. Wood, Chelsea House Publishers: Philadelphia, 1999.
7. "Sound Science." Etta Kaner, 1991, Addison-Wesley, New York.
8. "Sound." K. L. Siepak, 1994, Carson-Dellosa Publishing Co.