| APA | Smart Define. (2013). hard-heartedness thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/hard-heartedness/thesaurus/related |
| Chicago | Smart Define. 2013. "hard-heartedness thesaurus" https://smartdefine.org/hard-heartedness/thesaurus/related (accessed September 28, 2026). |
| Harvard | Smart Define 2013, hard-heartedness thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard-heartedness/thesaurus/related>. |
| MLA | Smart Define. "hard-heartedness thesaurus" 4 October 2013. Web. 28 September 2026. <https://smartdefine.org/hard-heartedness/thesaurus/related> |