Poonyawee Srisantear และ Ratchaphong Klinsrisuk. (2016) The valuation of use value and existence value of water onion (Crinum thaianum) in Ranong and Phang Nga provinces. Mahidol University:ม.ป.ท.Poonyawee Srisantear และ Ratchaphong Klinsrisuk. 2016. The valuation of use value and existence value of water onion (Crinum thaianum) in Ranong and Phang Nga provinces. ม.ป.ท.:Mahidol University;Poonyawee Srisantear และ Ratchaphong Klinsrisuk. The valuation of use value and existence value of water onion (Crinum thaianum) in Ranong and Phang Nga provinces. ม.ป.ท.:Mahidol University, 2016. Print.