"Where does the energy go?". Advanced technologies and energy efficiency, Fuel Economy Guide. US Dept. of Energy. 2009. مؤرشف من الأصل في 2019-04-11. اطلع عليه بتاريخ 2009-12-02.
"Where does the energy go?". Advanced technologies and energy efficiency, Fuel Economy Guide. US Dept. of Energy. 2009. مؤرشف من الأصل في 2019-04-11. اطلع عليه بتاريخ 2009-12-02.