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 the installation, maintenance, and use of emergency services communication systems: NFPA 1221 (2007 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 the Installation, Maintenance, and Use of Emergency Services Communication Systems: NFPA 1221. 2007 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 the Installation, Maintenance, and Use of Emergency Services Communication Systems: NFPA 1221. 2007 edition. Quincy, Mass.: National Fire Protection Association, 2006.