| APA | Smart Define. (2011). pain-pleasure principle thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/pain-pleasure_principle/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "pain-pleasure principle thesaurus" https://smartdefine.org/pain-pleasure_principle/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2011, pain-pleasure principle thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/pain-pleasure_principle/thesaurus/synonyms>. |
| MLA | Smart Define. "pain-pleasure principle thesaurus" 23 May 2011. Web. 29 September 2026. <https://smartdefine.org/pain-pleasure_principle/thesaurus/synonyms> |