Cita APA

American National Standards Institute (EE.UU.), & National Fire Protection Association (EE.UU.). (2006). NFPA 54: National fuel gas code. Washington, D.C.: American Gas Association ; Quincy, Mass. : National Fire Protection Association.

Citación estilo Chicago

American National Standards Institute (EE.UU.), y National Fire Protection Association (EE.UU.). NFPA 54: National Fuel Gas Code. Washington, D.C.: American Gas Association ; Quincy, Mass. : National Fire Protection Association, 2006.

Cita MLA

American National Standards Institute (EE.UU.), y National Fire Protection Association (EE.UU.). NFPA 54: National Fuel Gas Code. Washington, D.C.: American Gas Association ; Quincy, Mass. : National Fire Protection Association, 2006.