Eberhardt, Thomas L; So, Chi-Leung; Leduc, Daniel L (2018-07-20). "Wood Variability in Mature Longleaf Pine: Differences Related to Cardinal Direction for a Softwood in a Humid Subtropical Climate". Wood and Fiber Science. 50 (3): 323–336. doi:10.22382/wfs-2018-031. ISSN0735-6161.
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Eberhardt, Thomas L; So, Chi-Leung; Leduc, Daniel L (2018-07-20). "Wood Variability in Mature Longleaf Pine: Differences Related to Cardinal Direction for a Softwood in a Humid Subtropical Climate". Wood and Fiber Science. 50 (3): 323–336. doi:10.22382/wfs-2018-031. ISSN0735-6161.