Bartomeu Riutord Fe และ Martin Goerlich. (2015) User behaviour on google search engine. Stamford International University:ม.ป.ท.Bartomeu Riutord Fe และ Martin Goerlich. 2015. User behaviour on google search engine. ม.ป.ท.:Stamford International University;Bartomeu Riutord Fe และ Martin Goerlich. User behaviour on google search engine. ม.ป.ท.:Stamford International University, 2015. Print.