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Lee, S. and A. Raflo. Trees and Water. Archived 2016-09-21 at the Wayback Machine Virginia Water Resources Research Center. Virginia Tech. http://www.vwrrc.vt.edu/Treeswater/Part1.html
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Forest Products Laboratory (FPL) of the U.S. Department of Agriculture (USDA), Wood Handbook—Wood as an Engineering Material Archived 2021-04-24 at the Wayback Machine, General Technical Report series, № FPL‑GTR‑190, Centennial ed. (Madison, Wis.: USDA Forest Service, FPL, 2010‑04), p. 2‑2. https://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr190.pdf