Anieting, Akan. “Two- Phase Stratified Sampling Estimator for Population Mean in The Presence of Nonresponse Using Single Auxiliary Variable”. Mathematical Journal of Interdisciplinary Sciences 8, no. 2 (March 30, 2020): 49–56. Accessed April 27, 2024. https://mjis.chitkara.edu.in/index.php/mjis/article/view/207.