| APA | Smart Define. (2011). hydrogen ion concentration thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/hydrogen_ion_concentration/thesaurus/broader |
| Chicago | Smart Define. 2011. "hydrogen ion concentration thesaurus" https://smartdefine.org/hydrogen_ion_concentration/thesaurus/broader (accessed September 20, 2026). |
| Harvard | Smart Define 2011, hydrogen ion concentration thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/hydrogen_ion_concentration/thesaurus/broader>. |
| MLA | Smart Define. "hydrogen ion concentration thesaurus" 26 April 2011. Web. 20 September 2026. <https://smartdefine.org/hydrogen_ion_concentration/thesaurus/broader> |