Loper, O. E. (1978). Direct current fundamentals. Van Nostrand Reinhold Company.
Chicago Style aipamenaLoper, Orla E. Direct Current Fundamentals. New York: Van Nostrand Reinhold Company, 1978.
MLA aipamenaLoper, Orla E. Direct Current Fundamentals. Van Nostrand Reinhold Company, 1978.
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