TRANSISTOR MUSEUM Historic Transistor Photo Gallery BELL LABS TYPE M1752 http://semiconductormuseum.com/PhotoGallery/PhotoGallery_M1752.htm ↩
Morris, Peter Robin (1990). "4.2". A History of the World Semiconductor Industry. IEE History of Technology Series 12. London: Peter Peregrinus Ltd. p. 29. ISBN 0-86341-227-0. 0-86341-227-0 ↩