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