1. HAINES, R. W., HITTLE, D. Control systems for heating, ventilating, and air conditioning. 6th ed. Boston: Kluwer Academic, 2003. ISBN 1402074174 .
2. PETCHERS, N. Combined Heating, Cooling & Power Handbook - Technologies & Applications (2nd Edition. Fairmont Press, Inc., 2012. ISBN-13: 978-1466553347.