Cita APA

American National Standards Institute, American National Standards Institute, National Fire Protection Association (Estados Unidos), & National Fire Protection Association (Estados Unidos). (2008). Standard for high challenge fire walls, fire walls, and fire barrier walls: NFPA 221 (2009 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 High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls: NFPA 221. 2009 edition. Quincy, Mass.: National Fire Protection Association, 2008.

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 High Challenge Fire Walls, Fire Walls, and Fire Barrier Walls: NFPA 221. 2009 edition. Quincy, Mass.: National Fire Protection Association, 2008.