O. V. Esima, I. M. I, and S. Wordu , Trans., “Overcoming the Challenges of Logistics Outsourcing in Selected Oil and Gas Companies in Rivers State”, int.jour.sci.res.mana, vol. 7, no. 03, pp. 959–971, Mar. 2019, doi: 10.18535/ijsrm/v7i3.el06.