Al-Hadhrami, S. A. A. (2007). Estimation of the population mean based on ranked set sampling with auxiliary variable. Fakulti Sains Dan Teknologi, Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Hadhrami, Said Ali Abdullah. Estimation of the Population Mean Based on Ranked Set Sampling with Auxiliary Variable. Bangi: Fakulti Sains Dan Teknologi, Universiti Kebangsaan Malaysia, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Hadhrami, Said Ali Abdullah. Estimation of the Population Mean Based on Ranked Set Sampling with Auxiliary Variable. Fakulti Sains Dan Teknologi, Universiti Kebangsaan Malaysia, 2007.
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