| APA | Smart Define. (2011). ph.d. thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/ph.d./thesaurus/synonyms |
| Chicago | Smart Define. 2011. "ph.d. thesaurus" https://smartdefine.org/ph.d./thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2011, ph.d. thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/ph.d./thesaurus/synonyms>. |
| MLA | Smart Define. "ph.d. thesaurus" 23 May 2011. Web. 21 September 2026. <https://smartdefine.org/ph.d./thesaurus/synonyms> |