Ketkham, K. (1993) “ of the English Placement Test and of the Foundation English Achievement Test of Kasetsart Freshmen in 1989 and 1990”., Kasetsart Journal of Social Sciences, 14(2), pp. 170–177. available at: https://so04.tci-thaijo.org/index.php/kjss/article/view/243783 (accessed: 16 April 2025).