American Water Works Association & ProQuest (Firm). (2003). Recommended practice for backflow prevention and cross-connection control (3rd ed.). American Water Works Association.
Chicago-Zitierstil (17. Ausg.)American Water Works Association und ProQuest (Firm). Recommended Practice for Backflow Prevention and Cross-connection Control. 3rd ed. Denver, Colo.: American Water Works Association, 2003.
MLA-Zitierstil (9. Ausg.)American Water Works Association und ProQuest (Firm). Recommended Practice for Backflow Prevention and Cross-connection Control. 3rd ed. American Water Works Association, 2003.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.