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 the installation of warm air heating and air-conditioning systems (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 the Installation of Warm Air Heating and Air-conditioning Systems. 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 the Installation of Warm Air Heating and Air-conditioning Systems. 2009 edition. Quincy, Mass.: National Fire Protection Association, 2008.