APA (7th ed.) Citation

Keen, A. W. (1958). Frequency modulation: An introduction tothe fundamental principles (1. publ.). Pitman.

Chicago Style (17th ed.) Citation

Keen, Arthur W. Frequency Modulation: An Introduction Tothe Fundamental Principles. 1. publ. London: Pitman, 1958.

MLA (9th ed.) Citation

Keen, Arthur W. Frequency Modulation: An Introduction Tothe Fundamental Principles. 1. publ. Pitman, 1958.

Warning: These citations may not always be 100% accurate.