Hibshi، H. (1980). The extrem a values of real-valued continuous function on finite bounded closed intervals. مجلة كلية التربية، ع5 ، 13 - 19. مسترجع من http://search.mandumah.com/Record/655405
Hibshi، Hashim. "The Extrem a Values of Real-valued Continuous Function On Finite Bounded Closed Intervals." مجلة كلية التربية ع5 (1980): 13 - 19. مسترجع من http://search.mandumah.com/Record/655405