Thanakarn Vongvisitsin และ Sompong Amnuay-ngerntra. (2013) Travel preferences of russian tourists for tourist activity participation in thailand. Mahidol University:ม.ป.ท.Thanakarn Vongvisitsin และ Sompong Amnuay-ngerntra. 2013. Travel preferences of russian tourists for tourist activity participation in thailand. ม.ป.ท.:Mahidol University;Thanakarn Vongvisitsin และ Sompong Amnuay-ngerntra. Travel preferences of russian tourists for tourist activity participation in thailand. ม.ป.ท.:Mahidol University, 2013. Print.