Gray, A. (1917). Principles and practice of electrical engineering (2d ed., rev. and enl.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Gray, Alexander. Principles and Practice of Electrical Engineering. 2d ed., rev. and enl. New York: McGraw-Hill, 1917.
Lua MLA (8ú heag.)Gray, Alexander. Principles and Practice of Electrical Engineering. 2d ed., rev. and enl. McGraw-Hill, 1917.
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