Professor/ Khalafallah Ahmed Mohamed Arabi, Professor/ Salah Mohamed Ibrahim Ahmed, and Ms. Mawada Mustafa Yousef. 2026. “Factors Affecting Productivity in Sudan During the Period (1970-2019)”. White Nile Journal for Studies and Research, no. 27 (March):56-73. https://journals.wnu.edu.sd/index.php/wnjsr/article/view/92.