Himberg, N., L. Omoro, P. Pellikka, and O. Luukkanen. “The Benefits and Constraints of Participation in Forest Management. The Case of Taita Hills, Kenya”. Fennia - International Journal of Geography, vol. 187, no. 1, Jan. 2009, pp. 61-76, https://fennia.journal.fi/article/view/3704.