Sazoulang Douh. “A Framework for Assessing the Effectiveness of Competitive Tendering Process for Public Works Procurement at Pre-Contract Stage in Chad Republic”. Global Journals of Research in Engineering 15, no. G1 (January 15, 2015): 1–13. Accessed May 7, 2024. https://engineeringresearch.org/index.php/GJRE/article/view/1309.