Live Science (26 Januari 2013). Why are Tree Rings Lighter or Darker?. Dikutip  27 September 2019. https://www.livescience.com/32443-why-are-tree-rings-lighter-or-darker.html
Mason, Matthew (19 November 2018). Dendrochronology : What Tree Rings Tell Us About Past and Present. Dikutip 27 September 2019 dari environmentalscience.org. https://www.environmentalscience.org/dendrochronology-tree-rings-tell-us
Earth Science Communication Teams. What Can Trees Tell Us About The Climate Changes. Dikutip 27 September 2019 dari Nasa Climate Kids. https://climatekids.nasa.gov/tree-rings/
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