(2009). Water workforce trends: Impact of the 2009 economy : a comprehensive survey. American Water Works Association.
Chicago-Zitierstil (17. Ausg.)Water Workforce Trends: Impact of the 2009 Economy : A Comprehensive Survey. Denver, Colo: American Water Works Association, 2009.
MLA-Zitierstil (9. Ausg.)Water Workforce Trends: Impact of the 2009 Economy : A Comprehensive Survey. American Water Works Association, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.