ebrary, Inc, & American Water Works Association. (2001). Air-release, air/vacuum, and combination air valves. American Water Works Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)ebrary, Inc, و American Water Works Association. Air-release, Air/vacuum, and Combination Air Valves. Denver: American Water Works Association, 2001.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)ebrary, Inc, و American Water Works Association. Air-release, Air/vacuum, and Combination Air Valves. American Water Works Association, 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.