Cedamon, Edwin D., Eduardo O. Mangaoang, Nestor O. Gregorio, Arturo E. Pasa, and John F. Herbohn. 2005. “Nursery Management in Relation to Root Deformation, Sowing and Shading”. Annals of Tropical Research 27 (1):1-10. https://atr.vsu.edu.ph/article/view/427.