“HECKMAN MODEL FOR IDENTIFYING THE PROBABILITY OF ADOPTION OF IMPROVED VARIETIES OF SORGHUM, MILLET, GROUNDNUT AND SESAME IN NORTH KORDOFAN STATE, SUDAN”, UKJNRES, vol. 5, no. 01, pp. 26–43, Dec. 2025, Accessed: Jan. 01, 2026. [Online]. Available: https://journals.kordofan.edu.sd/jr/index.php/ukjnres/article/view/12