El Sahn، A. E.، و Mikhail، H. A. (1978). Recommendations Of The 2nd Seminar Of The Faculties Of Commerce Economics, Political Science and Statistics Heid in Alexandria University During The Period From 25 / 12 to 31 / 12 / 1977. مجلة اتحاد الجامعات العربية، ع13 ، 8 - 13. مسترجع من http://search.mandumah.com/Record/669008
El Sahn، Abd Elfatah، و Henry Anis Mikhail. "Recommendations Of The 2nd Seminar Of The Faculties Of Commerce Economics, Political Science and Statistics Heid in Alexandria University During The Period From 25 / 12 to 31 / 12 / 1977." مجلة اتحاد الجامعات العربية ع13 (1978): 8 - 13. مسترجع من http://search.mandumah.com/Record/669008