Bouchareb، H.، و Boubakir، A. (2025). The Impact of Investment in Research and Development on the Company’s Profitability: A Case Study of the Algerian Company Sonatrach. مجلة أبعاد اقتصادية، مج15, ع1 ، 494 - 516. مسترجع من http://search.mandumah.com/Record/1585363
Bouchareb، Hasna، و Amel Boubakir. "The Impact of Investment in Research and Development On the Company’s Profitability: A Case Study of the Algerian Company Sonatrach." مجلة أبعاد اقتصادية مج15, ع1 (2025): 494 - 516. مسترجع من http://search.mandumah.com/Record/1585363