abdel-razek, A. H., & hassan, a. (2018). optimum sample size for estimating dura crop yield rate in sudan. the institute of national planning.
Chicago Style (17. basım) Atıfabdel-razek, A. H., ve abdel-azim hassan. Optimum Sample Size for Estimating Dura Crop Yield Rate in Sudan. the institute of national planning, 2018.
MLA (9th ed.) Atıfabdel-razek, A. H., ve abdel-azim hassan. Optimum Sample Size for Estimating Dura Crop Yield Rate in Sudan. the institute of national planning, 2018.