| APA | Smart Define. (2013). past perfect tense thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/past_perfect_tense/thesaurus/broader |
| Chicago | Smart Define. 2013. "past perfect tense thesaurus" https://smartdefine.org/past_perfect_tense/thesaurus/broader (accessed September 27, 2026). |
| Harvard | Smart Define 2013, past perfect tense thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/past_perfect_tense/thesaurus/broader>. |
| MLA | Smart Define. "past perfect tense thesaurus" 18 May 2013. Web. 27 September 2026. <https://smartdefine.org/past_perfect_tense/thesaurus/broader> |