Nuanpan Lawson. (2019) Ratio estimators of population means using quartile function of auxiliary variable using double sampling. <i>Songklanakarin Journal of Science and Technology</i>, <i>41</i>(1), 117-122.Nuanpan Lawson. "Ratio estimators of population means using quartile function of auxiliary variable using double sampling". Songklanakarin Journal of Science and Technology 41 (2019):117-122.Nuanpan Lawson. Ratio estimators of population means using quartile function of auxiliary variable using double sampling. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2019.