National Fire Protection Association, National electrical code, & McPortland, J. F. (1987). McGraw-Hill's national electrical code handbook (19th ed.). McGraw-Hill.
Citace podle Chicago (17th ed.)National Fire Protection Association, National electrical code, a Joseph F. McPortland. McGraw-Hill's National Electrical Code Handbook. 19th ed. New York: McGraw-Hill, 1987.
Citace podle MLA (9th ed.)National Fire Protection Association, National electrical code, a Joseph F. McPortland. McGraw-Hill's National Electrical Code Handbook. 19th ed. McGraw-Hill, 1987.
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