Ugwu, Ikenna Christopher, and Kelechi Enyina Ugwu. “Green Supplier Selection and Flexible Sourcing: An Empirical Study of Nigeria Tertiary Institution”. Journal of Commerce, Management, and Tourism Studies 5, no. 2 (August 5, 2026): 278–290. Accessed August 21, 2026. https://ympn.co.id/index.php/JCMTS/article/view/492.