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| APA | Smart Define. (2015). billet-doux thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/billet-doux/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "billet-doux thesaurus" https://smartdefine.org/billet-doux/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, billet-doux thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/billet-doux/thesaurus/synonyms>. |
| MLA | Smart Define. "billet-doux thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/billet-doux/thesaurus/synonyms> |