National Fire Protection Association (Estados Unidos), American Gas Association, Ing, A., & Marando, M. (2020). National fuel gas code handbook (Eleventh edition.). Quincy, Massachusetts: National Fire Protection Association.
Chicago Style CitationNational Fire Protection Association (Estados Unidos), American Gas Association, Alex Ing, and Mike Marando. National Fuel Gas Code Handbook. Eleventh edition. Quincy, Massachusetts: National Fire Protection Association, 2020.
MLA CitationNational Fire Protection Association (Estados Unidos), American Gas Association, Alex Ing, and Mike Marando. National Fuel Gas Code Handbook. Eleventh edition. Quincy, Massachusetts: National Fire Protection Association, 2020.
Warning: These citations may not always be 100% accurate.