Van Hieu, N., 		Nam, N., 		Van Trung, P., & 		Minh Tuan, T.
(2019).
 Estimation of Tourists’ Willingness to Pay  in Ba Vi National Park: Choice Experiment Method.
<em>VNU Journal Of Science: Policy And Management Studies, 35</em>(4).
doi:10.25073/2588-1116/vnupam.4199