| APA | Smart Define. (2013). prior obligation thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/prior_obligation/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "prior obligation thesaurus" https://smartdefine.org/prior_obligation/thesaurus/antonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2013, prior obligation thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/prior_obligation/thesaurus/antonyms>. |
| MLA | Smart Define. "prior obligation thesaurus" 18 May 2013. Web. 29 September 2026. <https://smartdefine.org/prior_obligation/thesaurus/antonyms> |