1.
ขันธไชย ณ. Newman, W. Lawrence (2003). Social Research Methods: Qualitative and Quantitative Approaches. 5th Edition. New York: Pearson Education, Inc. (584pp.). JKBU [Internet]. 2014 Dec. 8 [cited 2024 May 4];15(2):103-6. Available from: https://so04.tci-thaijo.org/index.php/jkbu/article/view/25247