Barber, Bernard. “Foreword.” Syntony and Spark: The Origins of Radio, by HUGH G. J. AITKEN, Princeton University Press, Princeton, New Jersey, 1985, pp. vii-viii. JSTOR, www.jstor.org/stable/j.ctt7zv7w0.2. Accessed 14 Aug. 2020.
Barber, B. (1985). Foreword. In AITKEN H. (Author), Syntony and Spark: The Origins of Radio (pp. Vii-Viii). Princeton, New Jersey: Princeton University Press. Retrieved August 14, 2020, from www.jstor.org/stable/j.ctt7zv7w0.2
Barber, Bernard. "Foreword." In Syntony and Spark: The Origins of Radio, by AITKEN HUGH G. J., Vii-iii. Princeton, New Jersey: Princeton University Press, 1985. Accessed August 14, 2020. www.jstor.org/stable/j.ctt7zv7w0.2.
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