NAKORNTHAB, A.; CHANCHARAT, S. Length of Stay and Frequency of Visits in Chiangkhan (in Thai). Applied Economics Journal, [S. l.], v. 20, n. 2, p. 23–36, 2013. Disponível em: https://so01.tci-thaijo.org/index.php/AEJ/article/view/14991. Acesso em: 27 may. 2022.