El Hakim, F. (2016). THE ENERGY MANAGEMENT SYSTEMS ACCORDING TO THE GOLOBAL STANDARD, En.M.S. ISO 50001. test, 55(2), 24-19.
Farouk Ali El Hakim. "THE ENERGY MANAGEMENT SYSTEMS ACCORDING TO THE GOLOBAL STANDARD, En.M.S. ISO 50001". test, 55, 2, 2016, 24-19.
El Hakim, F. (2016). 'THE ENERGY MANAGEMENT SYSTEMS ACCORDING TO THE GOLOBAL STANDARD, En.M.S. ISO 50001', test, 55(2), pp. 24-19.
El Hakim, F. THE ENERGY MANAGEMENT SYSTEMS ACCORDING TO THE GOLOBAL STANDARD, En.M.S. ISO 50001. test, 2016; 55(2): 24-19.