| APA | Smart Define. (2013). heterocyclic compound thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/heterocyclic_compound/thesaurus/narrower |
| Chicago | Smart Define. 2013. "heterocyclic compound thesaurus" https://smartdefine.org/heterocyclic_compound/thesaurus/narrower (accessed September 29, 2026). |
| Harvard | Smart Define 2013, heterocyclic compound thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/heterocyclic_compound/thesaurus/narrower>. |
| MLA | Smart Define. "heterocyclic compound thesaurus" 18 May 2013. Web. 29 September 2026. <https://smartdefine.org/heterocyclic_compound/thesaurus/narrower> |