Rodríguez, Dora, et al. “Response from Tectona Grandis L.F. (Teak) to Fertilization in Hojancha and Nandayure Guanacaste, Costa Rica”. Tropical Journal of Environmental Sciences, vol. 7, no. 1, Jan. 1991, pp. 3-22, https://doi.org/10.15359/rca.7-1.1.