Lachache، A. (2019). Product Diversification in Algerian Enterprises: The Need for Cost Controlling and the Effect on Product Quality. مجلة الاستراتيجية والتنمية، مج9, ع3 ، 164 - 183. مسترجع من http://search.mandumah.com/Record/1006120
Lachache، Abdelhalim. "Product Diversification in Algerian Enterprises: The Need for Cost Controlling and the Effect On Product Quality." مجلة الاستراتيجية والتنمية مج9, ع3 (2019): 164 - 183. مسترجع من http://search.mandumah.com/Record/1006120