Brewin, Bob "Report on health risks from cell phones inconclusive. Computerworld 28 May, 2001, P. 7.
Forrest M. Mines, III. Science and Communication Circuits and Projects . "Sound". Radio Shack. 2000, p.100.
Brain, Marshall,
How Cell Phones
Work
, HowStuffWorks, (http://www.howstuffworks.com), HowStuffWorks, Inc., 2002.
