| APA | Smart Define. (2011). pleasure-unpleasure principle thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/pleasure-unpleasure_principle/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "pleasure-unpleasure principle thesaurus" https://smartdefine.org/pleasure-unpleasure_principle/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2011, pleasure-unpleasure principle thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/pleasure-unpleasure_principle/thesaurus/synonyms>. |
| MLA | Smart Define. "pleasure-unpleasure principle thesaurus" 23 May 2011. Web. 27 September 2026. <https://smartdefine.org/pleasure-unpleasure_principle/thesaurus/synonyms> |