Franklin

MLA

Keen, Arthur William. Frequency Modulation: an Introduction to the Fundamental Principles. London: Pitman, 1958.

APA

Keen, A. William. (1958). Frequency modulation: an introduction to the fundamental principles. London: Pitman.

Chicago

Keen, Arthur William. Frequency Modulation: An Introduction to the Fundamental Principles. London: Pitman, 1958.