Sarkar, T. K.; Mailloux, Robert; Oliner, Arthur A.; Salazar-Palma, M.; Sengupta, Dipak L. (2006). History of Wireless. [S.l.]: John Wiley & Sons. p. 230. ISBN978-0-471-78301-5
Sarkar, T. K.; Mailloux, Robert; Oliner, Arthur A.; Salazar-Palma, M.; Sengupta, Dipak L. (30 de Janeiro de 2006). History of Wireless. [S.l.]: John Wiley & Sons. p. 232. ISBN978-0-471-78301-5