Kraushaar,
Jack J., and Robert A. Ristinen. Energy and the Environment. New
York: John Wiley & Sons, Inc., 1999. pg.53
Blander,
M. "Calculations
of the Influence of Additives on Coal Combustion Deposits".
Argonne National Laboratory. p. 315.
Retrieved 17 December 2011.
Taylor,
Thomas N; Taylor, Edith L; Krings, Michael (2009). Paleobotany:
The biology and evolution of fossil plants
Rao,
P. N. (2007). "Moulding materials". Manufacturing
technology: foundry, forming and welding (2
ed.). New
Delhi: Tata McGraw-Hill. p. 107.
Energy
Information Administration. U.S. Government. 12 March 2002
<http://www.eia.doe.gov/>.
Schobert,
Harold H. Energy and Society. New York & London: Taylor and
Francis, 2002.
Boyle,
G., Everett, B. & Ramage, .J. (2003) Energy System and
sustainability. United Kingdom:
Open University
