1. Energy Development and Promotion Act B.E. 2535 (1992), Kingdom of Thailand.
2. Ministerial regulation B.E. 2539 (1996), Ministry of Energy, Kingdom of Thailand.
3. Energy Conservation Promotion Act (No. 2) B.E. 2550, Kingdom of thailand.
4. C. Asavatesanupap, M. Santikunaporn, and P. Wangsakarn, “Energy conservation through value-engineering for SMEs in Thailand”, The 5th European Conference Economics and Management of Energy in Industry Proceedings, April 2009, Vilamoura, Portugal.
5. P. Wangskarn, and M. Sasananan, “Comparison of performance-based vs cost-based energy saving project”, 2nd WSEAS/IASME International Conference on Energy Planning, Energy Saving, Environmental Education (EPESE’08) Corfu, Greece, October 26-28, 2008.