Pender, H., & Del Mar, W. A. (1949). Electrical engineers’ handbook.
Lua i Stíl Chicago (17ú heag.)Pender, Harold, agus William Arthur Del Mar. Electrical Engineers’ Handbook. New York, New York : Willey, 1949.
Lua MLA (9ú heag.)Pender, Harold, agus William Arthur Del Mar. Electrical Engineers’ Handbook. 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.