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APASmart Define. (2015). billion years thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/billion_years/thesaurus/synonyms
ChicagoSmart Define. 2015. "billion years thesaurus" https://smartdefine.org/billion_years/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, billion years thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/billion_years/thesaurus/synonyms>.
MLASmart Define. "billion years thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/billion_years/thesaurus/synonyms>