Santapol Sungsongkiat และ Vimolchaya Yanasugondha. (2009) The attitudes towards the e-customs system in a Japanese shipping company its subsidiaries, and their clients. Thammasat University:ม.ป.ท.Santapol Sungsongkiat และ Vimolchaya Yanasugondha. 2009. The attitudes towards the e-customs system in a Japanese shipping company its subsidiaries, and their clients. ม.ป.ท.:Thammasat University;Santapol Sungsongkiat และ Vimolchaya Yanasugondha. The attitudes towards the e-customs system in a Japanese shipping company its subsidiaries, and their clients. ม.ป.ท.:Thammasat University, 2009. Print.