| APA | Smart Define. (2011). polyphosphoric acid thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/polyphosphoric_acid/thesaurus/narrower |
| Chicago | Smart Define. 2011. "polyphosphoric acid thesaurus" https://smartdefine.org/polyphosphoric_acid/thesaurus/narrower (accessed September 23, 2026). |
| Harvard | Smart Define 2011, polyphosphoric acid thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/polyphosphoric_acid/thesaurus/narrower>. |
| MLA | Smart Define. "polyphosphoric acid thesaurus" 26 April 2011. Web. 23 September 2026. <https://smartdefine.org/polyphosphoric_acid/thesaurus/narrower> |