Techakittiroj, R. “A Study of Price-Changed-To-Dividend Ratio on Ex-Dividend Dates: The Case Study of Stock Exchange of Thailand in 2012-2014”. AU-GSB E-JOURNAL, vol. 9, no. 2, Jan. 2017, p. 23, http://www.assumptionjournal.au.edu/index.php/AU-GSB/article/view/2537.