Wiwat Wangcharoen และ Piyaporn Chueamchaitrakun. (2016) EFFECT OF NUMBER OF QUESTIONS AND SCALE TYPES ON THAI CONSUMER RATING TESTS. <i>Maejo Engineering and Agro Industry Journal</i>, <i>1</i>(1), 1-9.Wiwat Wangcharoen และ Piyaporn Chueamchaitrakun. "EFFECT OF NUMBER OF QUESTIONS AND SCALE TYPES ON THAI CONSUMER RATING TESTS". Maejo Engineering and Agro Industry Journal 1 (2016):1-9.Wiwat Wangcharoen และ Piyaporn Chueamchaitrakun. EFFECT OF NUMBER OF QUESTIONS AND SCALE TYPES ON THAI CONSUMER RATING TESTS. Faculty of Engineering and Agro-Industry Meajo University:ม.ป.ท. 2016.