^Lee, S. and A. Raflo. Trees and Water.互联网档案馆的存檔,存档日期2016-09-21. Virginia Water Resources Research Center. Virginia Tech.
^Forest Products Laboratory (FPL) of the U.S. Department of Agriculture (USDA), Wood Handbook—Wood as an Engineering Material (页面存档备份,存于互联网档案馆), General Technical Report series, № FPL‑GTR‑190, Centennial ed. (Madison, Wis.: USDA Forest Service, FPL, 2010‑04), p. 2‑2.
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