1. American Society of Testing and Materials 2001 Standard test methods for specific gravity of wood and wood-based materials
2. Clark , A. Daniels , R. Jordan , L. 2006 Effect of tree age, rate of growth, and geographic location on plantation loblolly pine wood stiffness and strength
3. Variation in the cell wall density of wood;Kellogg;Wood Fiber,1969
4. Utilization of Southern Pines, Vol 1;Koch;USDA For. Serv. Handb.,1972