Koech, D. ., and M. . Kibuine. “ROLE OF PRODUCT RESEARCH AND DEVELOPMENT ON EARLY SUPPLIER INVOLVEMENT AND PERFORMANCE OF TARDA, KENYA”. African Journal of Emerging Issues, vol. 7, no. 1, Jan. 2025, pp. 39-52, https://ajoeijournals.org/sys/index.php/ajoei/article/view/748.