Widowati, S., G. Ginaya, and N. N. Triyuni. “Penta Helix Model to Develop Ecotourism: Empowering the Community for Economic and Ecological Sustainability”. International Journal of Social Sciences and Humanities, vol. 3, no. 2, June 2019, pp. 31-46, doi:10.29332/ijssh.v3n2.288.