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2. https://books.google.co.in/books?id=maUQAgAAQBAJ&pg=PA6&lpg=PA6&dq=EM+signal+attenuation+in+outer+space?&source=bl&ots=c2nBF7gLfE&sig=MHZGkOGj7NEXw0rQ9ITspHbHZE&hl=en&sa=X&ved=0ahUKEwj6iK7Mv8zJAhWNHI4KHa-nAToQ6AEIQjAH#v=onepage&q=EM%20signal%20attenuation%20in%20outer%20space%3F&f=false.
3. D. P. Agrawal and Q. A. Zeng, Introduction to Wireless and Mobile Systems, 4th Edition, Cengage Learning, 650 pages, 2016.
4. Rachel Lieberman, Brandel France de Bravo, and Diana Zuckerman, “Can Cell Phones Harm Our Health?,” National Research Center for Women and Families, August 2008, Retrieved August 13, 2013.
5. David Strayer, Frank Drews, and Dennis Crouch, “Fatal Distraction? A Comparison Of The Cell-Phone Driver And The Drunk Driver,” University of Utah Department of Psychology, 2003, Retrieved 2009-06-27.