WALKER, J. R. (1981). Exploring power technology: Basic fundamentals. The Goodheart-Willcox.
Lua i Stíl Chicago (17ú heag.)WALKER, John R. Exploring Power Technology: Basic Fundamentals. Illinois: The Goodheart-Willcox, 1981.
Lua MLA (9ú heag.)WALKER, John R. Exploring Power Technology: Basic Fundamentals. The Goodheart-Willcox, 1981.
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