Sheela Devi และ Sumaia Farzana. (2022) A Study of Eco-Tourism Promotion in Phetchaburi Province. International Program in Business Administration (IBBA) International College, Siam University:ม.ป.ท.Sheela Devi และ Sumaia Farzana. 2022. A Study of Eco-Tourism Promotion in Phetchaburi Province. ม.ป.ท.:International Program in Business Administration (IBBA) International College, Siam University;Sheela Devi และ Sumaia Farzana. A Study of Eco-Tourism Promotion in Phetchaburi Province. ม.ป.ท.:International Program in Business Administration (IBBA) International College, Siam University, 2022. Print.