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2
letters of marque
1
letter of credit
1
letter of introduction
1
letters of request
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APASmart Define. (2015). billet-doux thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/billet-doux/thesaurus/synonyms
ChicagoSmart Define. 2015. "billet-doux thesaurus" https://smartdefine.org/billet-doux/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, billet-doux thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/billet-doux/thesaurus/synonyms>.
MLASmart Define. "billet-doux thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/billet-doux/thesaurus/synonyms>