Seyhak Khon และ Udomsak Seenprachawong. (2020) The public demand for a dengue fever vaccine : a contingent valuation survey in Phnom Penh, Cambodia. National Institute of Development Administration:ม.ป.ท.Seyhak Khon และ Udomsak Seenprachawong. 2020. The public demand for a dengue fever vaccine : a contingent valuation survey in Phnom Penh, Cambodia. ม.ป.ท.:National Institute of Development Administration;Seyhak Khon และ Udomsak Seenprachawong. The public demand for a dengue fever vaccine : a contingent valuation survey in Phnom Penh, Cambodia. ม.ป.ท.:National Institute of Development Administration, 2020. Print.