Lukas Pochlauer และ Ronald Vatananan. (2015) Motivation to buy healthy snacks. Stamforn International University:ม.ป.ท.Lukas Pochlauer และ Ronald Vatananan. 2015. Motivation to buy healthy snacks. ม.ป.ท.:Stamforn International University;Lukas Pochlauer และ Ronald Vatananan. Motivation to buy healthy snacks. ม.ป.ท.:Stamforn International University, 2015. Print.