- Brend Stoy. Wunsch Energie Sonne. Verlag Gmbh. Heidelberg. Germany. (1978).
- Hughes L. A Wind Energy Conversion and Storage System for Use in Underdeveloped Countries. IECEC. Washinton. USA. (1973).
- Nafea Mahmoud Ahmad Mahmoud Ahmad. Enhancing the Added Value to Industrial Design Products through Making Use of their Functional Energy. PhD. Faculty of Applied Arts – Helwan University. Arab republic of Egypt. ( 2015 ).
- Nafea Mahmoud, Dr. Self energy of equipment's and engineering machines the ideology of sustainable energy. Publisher by author. Arab republic of Egypt. (2016).
- Meinel A.B Applied Solar Energy an Introduction. University of Arizona. USA. (1976).
- Venikov V.A. (Prof.). Introduction to Energy Technology. Mir Publishers. Moscow. (1981).
- William H. Engineering Electromagnetic. Kosaido Printing. Tokyo. (1981).
- World Energy Council. Survey of Energy Resources. USA. (2007).
Website: