Rahmatzai, Saeedullah, and Saadatullah Safi. “Competence and Performance Versus Langue and Parole: A ‎Comparative Linguistic Analysis”. Nangarhar University Social Science Journal 3, no. 01 (April 30, 2026): 27–32. Accessed May 2, 2026. https://nussj.nu.edu.af/index.php/nussj/article/view/79.