American National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), & National Fire Protection Association (Estados Unidos). (2008). Recommended practice for the classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas: NFPA 497 (2008 edition.). Quincy, Mass.: National Fire Protection Association.
Chicago Style CitationAmerican National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), and National Fire Protection Association (Estados Unidos). Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (classified) Locations for Electrical Installations in Chemical Process Areas: NFPA 497. 2008 edition. Quincy, Mass.: National Fire Protection Association, 2008.
MLA CitationAmerican National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), and National Fire Protection Association (Estados Unidos). Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (classified) Locations for Electrical Installations in Chemical Process Areas: NFPA 497. 2008 edition. Quincy, Mass.: National Fire Protection Association, 2008.