Bayu, Tadele, and Sisay Genanu. “A Contingent Valuation Approach to Household’s Willingness to Pay for Improved Piped Water Access in North Wollo Zone, Ethiopia”. Ethiopian Journal of Economics 33, no. 2 (May 11, 2026): 63–97. Accessed October 24, 2026. https://www.ajol.info/index.php/eje/article/view/324092.