“The Impact of Applying TQM Standards to Performance of Ngueli Customs Station (Tchad)”. Journal Of Development Studies & Entrepreneurship 2, no. 1 (December 26, 2024): 21–37. Accessed December 5, 2025. https://review.univ-oeb.dz/ojs.jdse/index.php/jdse/article/view/15.