Valley, George E. Jr.; Wallman, Henry (1948), Amplificadores de tubo de vacío, MIT Radiation Laboratory Series 18, Nueva York: McGraw-Hill.. Reseñas: Ridenour, Louis N. (1948), "Amplificadores de tubo de vacío", Massachusetts Institute of Technology Radiation Laboratory Series; Giacoletto, L. J. (1949), "Noticias del Instituto y notas de radio", Proceedings of the I.R.E., 37 (8): 907, doi:10.1109/JRPROC.1949.229980; Frankland, Scott (1998), Vacuum tube electronics: Reviews of the major texts (PDF), Perkins Electro-Acoustical Research Laboratory.