Energy roadmap: a water and wastewater utility guide to more sustainable energy management. Alexandria, VA: Water Environment Federation, 2013. ISBN 9781523103072. Dostupné také z: https://proxy.k.utb.cz/login?url=https://app.knovel.com/hotlink/toc/id:kpERAWWUG1/energy-roadmap-a?kpromoter=marc.