Salih, Waleed Khalid, y Essia Ries Ahmed, Noor Fareen Abdul Rahim. «The Internal Supply Chain of Operation and Green Sustainability». Opción 350 (agosto 13, 2019): 1221-1231. Accedido agosto 2, 2025. http://www.produccioncientifica.luz.edu.ve/index.php/opcion/article/view/24768.