Sadek، Z.، و Zouhir، R. (2019). Contribution of the Environmental Management System to Improve the Environmental Performance of Organization: A Case Study of The Harbor Institution of Skikda. مجلة الاقتصاد والتنمية البشرية، مج10, ع2 ، 270 - 282. مسترجع من http://search.mandumah.com/Record/1034022
Sadek، Zouyene، و Rajraj Zouhir. "Contribution of the Environmental Management System to Improve the Environmental Performance of Organization: A Case Study of The Harbor Institution of Skikda." مجلة الاقتصاد والتنمية البشرية مج10, ع2 (2019): 270 - 282. مسترجع من http://search.mandumah.com/Record/1034022