APA aipamena

National District Heating Association. Official proceedings, Annual meeting of the National District Heating Association. National District Heating Association.

Chicago Style aipamena

National District Heating Association. Official Proceedings, Annual Meeting of the National District Heating Association. Pittsburgh, Pa.: National District Heating Association.

MLA aipamena

National District Heating Association. Official Proceedings, Annual Meeting of the National District Heating Association. National District Heating Association.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.