APA (7th ed.) Citation

Knovel (Firm). (2016). Air valves: Air-release, air/vacuum, and combination (Second edition.). American Water Works Association.

Chicago Style (17th ed.) Citation

Knovel (Firm). Air Valves: Air-release, Air/vacuum, and Combination. Second edition. Denver, CO: American Water Works Association, 2016.

MLA (9th ed.) Citation

Knovel (Firm). Air Valves: Air-release, Air/vacuum, and Combination. Second edition. American Water Works Association, 2016.