1. Corresponding author; School of Business and Law, University of Agder, 4604 Kristiansand, Norway; Hp +; and Faculty of Economics and Business, Gadjah Mada University, Indonesia.
2. Faculty of Forestry, Gadjah Mada University, Indonesia.
3. Faculty of Forestry, and Research Centre of Agroecology and Land Resources, Gadjah Mada University, Indonesia.