National Fire Protection Association. (1992). National electrical code. National Fire Protection Association.
Citazione stile Chigago Style (17a edizione)National Fire Protection Association. National Electrical Code. Quincy, Ma: National Fire Protection Association, 1992.
Citatione MLA (9a ed.)National Fire Protection Association. National Electrical Code. National Fire Protection Association, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.