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دليل المستخدم
Dobretsberger، J. (1967). SOME THEORETICAL QUESTIONS OF PLANING WITH SPECIAL REGARD TO THE DEVELOPING COUNTRIES. مجلة مصر المعاصرة، مج58, ع329 ، 5 - 43. مسترجع من http://search.mandumah.com/Record/663456
Dobretsberger، Josef. "SOME THEORETICAL QUESTIONS OF PLANING WITH SPECIAL REGARD TO THE DEVELOPING COUNTRIES." مجلة مصر المعاصرة مج58, ع329 (1967): 5 - 43. مسترجع من http://search.mandumah.com/Record/663456