1. William Fothergill Cooke, The Electric Telegraph, W. H. Smitha and Sons, London, 1857.
2. Hubbard and Geoffrey, Cooke and Wheatstone and the Invention of the Electric Telegraph, Routledge and Kegan Paul Publications, London, 1965.
3. Christopher Buff, “Radio receivers-past and present,” Proc. of the IRE, vol. 50, no. 5, pp. 884–891, May 1962.
4. U. S. Bureau of Naval Personnel, Basic Electronics, Courier Dover Publications, 1973.
5. M. Steyaert J. Janssens, B. De Muer, M. Borremans, and N. Itoh, “A 2 V CMOS cellular transceiver front-end,” IEEE J. of Solid State Circuits, vol. 35, no. 12, pp. 1895–1907, Dec. 2000.