| APA | Smart Define. (2015). hard to believe thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/hard_to_believe/thesaurus/related |
| Chicago | Smart Define. 2015. "hard to believe thesaurus" https://smartdefine.org/hard_to_believe/thesaurus/related (accessed September 30, 2026). |
| Harvard | Smart Define 2015, hard to believe thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/hard_to_believe/thesaurus/related>. |
| MLA | Smart Define. "hard to believe thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/hard_to_believe/thesaurus/related> |