Umar S, Kadeko I. Model of Tree Shade Value by Contingent Valuation Technique on the Cocoa Agroforestry of Central Sulawesi Province. 5003 [Internet]. 2015 Sep. 15 [cited 2024 Dec. 22];5(9):439-51. Available from: https://archive.aessweb.com/index.php/5003/article/view/3743