(1940). FM: An introduction to frequency modulation / by John F. Rider.
Lua i Stíl Chicago (17ú heag.)FM: An Introduction to Frequency Modulation / by John F. Rider. 1940.
Lua MLA (9ú heag.)FM: An Introduction to Frequency Modulation / by John F. Rider. 1940.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.