APA (7th ed.) Citation

(1993). McGraw-Hill's national electrical code handbook (21st ed.). McGraw-Hill.

Chicago Style (17th ed.) Citation

McGraw-Hill's National Electrical Code Handbook. 21st ed. New York: McGraw-Hill, 1993.

MLA (9th ed.) Citation

McGraw-Hill's National Electrical Code Handbook. 21st ed. McGraw-Hill, 1993.