Beladjal, Fouzia. “Samples in Social Sciences and Methods of Withdrawing”. Journal of Economic Growth and Entrepreneurship 4, no. 2 (January 30, 2021): 166-181. Accessed April 20, 2024. https://jege.univ-adrar.edu.dz/index.php?journal=jege&page=article&op=view&path[]=123.