| APA | Smart Define. (2011). doctor of philosophy thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/doctor_of_philosophy/thesaurus/broader |
| Chicago | Smart Define. 2011. "doctor of philosophy thesaurus" https://smartdefine.org/doctor_of_philosophy/thesaurus/broader (accessed September 29, 2026). |
| Harvard | Smart Define 2011, doctor of philosophy thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/doctor_of_philosophy/thesaurus/broader>. |
| MLA | Smart Define. "doctor of philosophy thesaurus" 26 April 2011. Web. 29 September 2026. <https://smartdefine.org/doctor_of_philosophy/thesaurus/broader> |