David Onwuchekwa, Ph.D, Onyemezikeya, Obubeleye George. TRANSPORTATION MODEL AND COST CONTROL OF PLASTIC MANUFACTURING FIRMS IN PORT HARCOURT. bwjournal [Internet]. 2025 Feb. 24 [cited 2026 Jul. 16];2:149-60. Available from: https://mail.bwjournal.org/index.php/bsjournal/article/view/2772