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Becker, R. T.; Marshall, J. E. A.; Da Silva, A. -C.; Agterberg, F. P.; Gradstein, F. M.; Ogg, J. G. (2020-01-01), Gradstein, Felix M.; Ogg, James G.; Schmitz, Mark D.; Ogg, Gabi M. (eds.), "Chapter 22 - The Devonian Period", Geologic Time Scale 2020, Elsevier, pp. 733–810, ISBN978-0-12-824360-2, retrieved 2022-02-21
Thorez, Jacques; Dreesen, Roland; Streel, Maurice (2006). "Frasnian". Geologica Belgica. 9 (1–2): 27–45. Archived from the original on May 1, 2014. Retrieved 16 March 2013.