Diakses tanggal 18 September 2017
- https://creation.com/evidence-for-multiple-ring-growth-per-year-in-bristlecone-pines
- http://nasional.kompas.com/read/2012/05/09/09055841/Paleoklimatologi:.Berburu.ke.Masa.Lampau..Meramal.Masa.Depan
- https://www.theforestacademy.com/tree-knowledge/annual-growth-rings/#.Wb-jwzWdPIU
- http://www.encyclopedia.com/plants-and-animals/botany/botany-general/annual-rings
- https://books.google.co.id
- https://www.britannica.com/science/growth-ring-plant-anatomy
- http://ltrr.arizona.edu/sites/ltrr.arizona.edu/files/bibliodocs/Douglass_1922.pdfhttp://www.woodlands.co.uk/blog/woodland-activities/annual-rings-climate-and-historyÂ
- Irnaningtyas.2017.BIOLOGI UNTUK SMA/MA KELAS XI.Erlangga,Jakarta
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