1. ASHRAE (American Society of Heating, Refrigeration and Air-conditioning Engineers), ASHRAE Handbook–Fundamentals, ASHRAE. ISBN 1-883413-88-5.
2. BRE, TNO, CSTB, UOXF, Integrated Control Strategies for Improving Energy Management and Comfort in New and Existing Buildings (INTECOM), A JOULE III Project, Contract JOE3-CT98-0089, 1998–2001.
3. BRE, ICITE, Controller Efficiency Improvement for Commercial and Industrial Gas and Oil Fired Boilers, A CRAFT Project, Contract JOE-CT98-7010, 1999–2001.
4. CIBSE, CIBSE Guide on Automation Control Systems for Buildings, Version 4, 1999.
5. Crow, Heating Systems and their Control, General Information Report 40, Best Practice Programme, 1996.