(1968). National Electrical Code 1968: A USA Standard. National Fire Protection Association.
Čikaški stil citiranja (17. izdanje)National Electrical Code 1968: A USA Standard. Boston: National Fire Protection Association, 1968.
MLA način citiranja (9. izdanje)National Electrical Code 1968: A USA Standard. National Fire Protection Association, 1968.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.