APA-viite (7. p.)

National Fire Protection Association, National electrical code, & McPortland, J. F. (1987). McGraw-Hill's national electrical code handbook (19th ed.). McGraw-Hill.

Chicago-viite (17. p.)

National Fire Protection Association, National electrical code, ja Joseph F. McPortland. McGraw-Hill's National Electrical Code Handbook. 19th ed. New York: McGraw-Hill, 1987.

MLA-viite (9. p.)

National Fire Protection Association, National electrical code, ja Joseph F. McPortland. McGraw-Hill's National Electrical Code Handbook. 19th ed. McGraw-Hill, 1987.