حمدي، شريف محمود. (2023). A Proposed Model for Crisis Management for the Outbreak of the Covid-19 Epidemic Application to the Tourism Sector in the Arab Republic of Egypt. مجلة السياسة والاقتصاد، مج19, ع18 ، 136 - 160. مسترجع من http://search.mandumah.com/Record/1515384
حمدي، شريف محمود. "A Proposed Model for Crisis Management for the Outbreak of the Covid-19 Epidemic Application to the Tourism Sector in the Arab Republic of Egypt." مجلة السياسة والاقتصاد مج19, ع18 (2023): 136 - 160. مسترجع من http://search.mandumah.com/Record/1515384