Withaya Sirithanomwong และ Sompong Amnuay-ngerntra. (2011) Motivation for pilgrimage travel : a case study of Catholic Shrines in Thailand. Mahidol University:ม.ป.ท.Withaya Sirithanomwong และ Sompong Amnuay-ngerntra. 2011. Motivation for pilgrimage travel : a case study of Catholic Shrines in Thailand. ม.ป.ท.:Mahidol University;Withaya Sirithanomwong และ Sompong Amnuay-ngerntra. Motivation for pilgrimage travel : a case study of Catholic Shrines in Thailand. ม.ป.ท.:Mahidol University, 2011. Print.