Briant and, C.L.; Bewlay, Bernard P. (1995). "The Coolidge Process for Making Tungsten Ductile: The Foundation of Incandescent Lighting". MRS Bulletin. 20 (8): 67–73. Bibcode:1995MRSBu..20...67B. doi:10.1557/S0883769400045164.
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Briant and, C.L.; Bewlay, Bernard P. (1995). "The Coolidge Process for Making Tungsten Ductile: The Foundation of Incandescent Lighting". MRS Bulletin. 20 (8): 67–73. Bibcode:1995MRSBu..20...67B. doi:10.1557/S0883769400045164.