| APA | Smart Define. (2016). astonishingly thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/astonishingly/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "astonishingly thesaurus" https://smartdefine.org/astonishingly/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, astonishingly thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/astonishingly/thesaurus/synonyms>. |
| MLA | Smart Define. "astonishingly thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/astonishingly/thesaurus/synonyms> |