Gray, A. (1914). Principles and practice of electrical engineering. McGraw-Hill Book Company, inc..
Lua i Stíl Chicago (17ú heag.)Gray, Alexander. Principles and Practice of Electrical Engineering. New York [etc.]: McGraw-Hill Book Company, inc., 1914.
Lua MLA (8ú heag.)Gray, Alexander. Principles and Practice of Electrical Engineering. McGraw-Hill Book Company, inc., 1914.
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