Cita APA

American National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), & National Fire Protection Association (Estados Unidos). (2006). Standard for fire safety and emergency symbols: NFPA 170 (2006 edition.). Quincy, Mass.: National Fire Protection Association.

Citación estilo Chicago

American National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), y National Fire Protection Association (Estados Unidos). Standard for Fire Safety and Emergency Symbols: NFPA 170. 2006 edition. Quincy, Mass.: National Fire Protection Association, 2006.

Cita MLA

American National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), y National Fire Protection Association (Estados Unidos). Standard for Fire Safety and Emergency Symbols: NFPA 170. 2006 edition. Quincy, Mass.: National Fire Protection Association, 2006.