Mutangili, S. K. “Influence of Green Procurement Practices in Supply Chain Management and Leadership on Performance of Parastatals in Kenya; A Case of Kenya Airways and Kenya Pipeline”. Journal of Procurement & Supply Chain, vol. 3, no. 2, May 2019, pp. 64-78, https://stratfordjournalpublishers.org/journals/index.php/journal-of-procurement-supply/article/view/282.