"Circular economy, motivations for its adoption, and the main challenges in its implementation “A presentation of the German experience (2017-2020)”" (2025) مجلة اقتصاديات شمال افريقيا, 20(34), ص 1–16. موجود في: https://journals.univ-chlef.dz/index.php/renaf/article/view/217 (تاريخ الوصول: 23 أكتوبر 2026).