(2001). Air-release, air/vacuum, and combination air valves. American Water Works Association.
Chicago-Zitierstil (17. Ausg.)Air-release, Air/vacuum, and Combination Air Valves. Denver: American Water Works Association, 2001.
MLA-Zitierstil (9. Ausg.)Air-release, Air/vacuum, and Combination Air Valves. American Water Works Association, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.