ขันธไชย ณ. Newman, W. Lawrence (2003). Social Research Methods: Qualitative and Quantitative Approaches. 5th Edition. New York: Pearson Education, Inc. (584pp.). KASEM BUNDIT JOURNAL, [S. l.], v. 15, n. 2, p. 103–106, 2014. Disponível em: https://so04.tci-thaijo.org/index.php/jkbu/article/view/25247. Acesso em: 4 may. 2024.