Nguyen Thi Haiyen และ Martin Goerlich. (2014) Comparison between thaiand vietnamese coffee drinkers in consumer behavior. Stamford Internatioanl University:ม.ป.ท.Nguyen Thi Haiyen และ Martin Goerlich. 2014. Comparison between thaiand vietnamese coffee drinkers in consumer behavior. ม.ป.ท.:Stamford Internatioanl University;Nguyen Thi Haiyen และ Martin Goerlich. Comparison between thaiand vietnamese coffee drinkers in consumer behavior. ม.ป.ท.:Stamford Internatioanl University, 2014. Print.