"ENERGY"; Gordon J. Aubrecht II.

"ENERGY: Principles, problems, alternatives"; Joseph Priest.

"ENERGY RESOURCES: Geology, supply and demand"; G.C. Brown and E. Skipsey.

"ENERGY IN WORLD HISTORY"; Vaclav Smil.

"CALCULUS SINGLE VARIABLE: EARLY TRASCENDENTALS; James Stewart.

"MULTIVARIABLE CALCULUS"; James Stewart.

"HANDBOOK OF ENERGY ENGINEERING"; Albert Thuman P.E. CEM, and Paul  Mehta,Ph.D.

"ENERGY AND THE ENVIRONMENT",  Robert A. Ristinen and Jack J. Kraushaar.

"MACROECONOMICS"; Olivier Blanchard.

"INTERNATIONAL ECONOMICS; Dominick Salvatore.

"MICROECONOMICS; Robert S. Pindyck and Daniel L. Rubinfeld.

"ENVIRONMENTAL SCIENCE"; P.Walton Purdom and Stanley H. Anderson.

"MICROECONOMIC THEORY"; Walter Nicholson.