Original: ISBN 0-8493-8578-4 Thomas P. Hughes, Networks of Power: Electrification in Western Society 1880-1930, The Johns Hopkins University Press,Baltimore 1983 ISBN 0-8018-2873-2, an excellent overview of development during the first 50 years of commercial electric power Westinghouse Electric Corporation, "Electric power transmission patents; Tesla polyphase system".
Simplified: ISBN 0-8493-8578-4 Westinghouse Electric Corporation, "Electric power transmission patents; Tesla polyphase system".