1. Adamopoulos, S., Passialis, C., Voulgaridis, E. (2007) Strength properties of juvenile and mature wood in black locust (Robinia pseudoacacia L.). Wood Fiber Sci. 39:241–249.
2. American Society for Testing and Materials (ASTM). (2007) Standard 2017-05. Standard test method for accelerated laboratory test of natural decay resistance of wood.
3. Arce, V.H. Relationship to sapwood-heartwood and physical characteristics of the Teak wood (Tectona grandis) in 10-year old plantations with two different densities of plantation in Playa Garza Guanacaste, Costa Rica. Undergraduate thesis in Forestry Engineering. National University. Heredia, Costa Rica, 2001. p. 36.
4. Bamber, R.K. (1976) Heartwood, its function and formation. Wood Sci. Technol. 10:1–8.
5. Bamber, R.K., Fukazawa, K. (1985) Sapwood and heartwood: a review. For. Prod. Abstr. 8:265–278.