Singh, L. P. (1994). Digital protection: Protective relaying from electromechanical to microprocessor. Wiley.
Lua i Stíl Chicago (17ú heag.)Singh, L. P. Digital Protection: Protective Relaying from Electromechanical to Microprocessor. New York: Wiley, 1994.
Lua MLA (9ú heag.)Singh, L. P. Digital Protection: Protective Relaying from Electromechanical to Microprocessor. Wiley, 1994.
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