@book{c?engel_boles_2015, title={Thermodynamics: An engineering approach (8th ed.)}, ISBN={9780073398174}, publisher={New York, NY: McGraw-Hill Education}, author={C?engel, Y. A. and Boles, M. A.}, year={2015} }
 @book{cengel_boles_2008, title={Thermodynamics: an engineering approach. (6th ed.)}, ISBN={0073529214}, publisher={Boston: McGraw-Hill Higher Education}, author={Cengel, Y. A. and Boles, M. A.}, year={2008} }
 @book{cengel_boles_2006, title={Thermodynamics: an engineering approach. (5th ed.)}, ISBN={0072884959}, publisher={Boston: McGraw-Hill Higher Education}, author={Cengel, Y. A. and Boles, M. A.}, year={2006} }
 @book{cengel_boles_2002, title={Thermodynamics: an engineering approach. (4th ed.)}, ISBN={0072383321}, publisher={Boston: McGraw-Hill}, author={Cengel, Y. A. and Boles, M. A.}, year={2002} }
 @book{cengel_boles_1998, title={Thermodynamics: an engineering approach. (3rd ed.)}, ISBN={0070119279}, publisher={Boston: McGraw-Hill}, author={Cengel, Y. A. and Boles, M. A.}, year={1998} }