APA-referens (7:e uppl.)
Asay, S. F. (2015). Backflow prevention and cross-connection control: Recommended practices (Fourth edition.). American Water Works Association.
Chicago-referens (17:e uppl.)
Asay, Stuart F. Backflow Prevention and Cross-connection Control: Recommended Practices. Fourth edition. Denver, Colorado: American Water Works Association, 2015.
MLA-referens (9:e uppl.)
Asay, Stuart F. Backflow Prevention and Cross-connection Control: Recommended Practices. Fourth edition. American Water Works Association, 2015.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.