PHOTHITAY, A.; HOONGSANGPHA, S.; SENGCHANH, S.; PHONGSAVATH, P.; PHANLA, P. The Study on the Willingness to Pay for Conserving Historical Site of Domestic Tourists: A Case Study on Historical Site of Hueanchan in Luang Prabang City, Lao PDR. sujournal 2020, 6, 1456-1470.