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| letter box(noun, mailbox) |
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| APA | Smart Define. (1970). in-box thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/in-box/thesaurus/synonyms |
| Chicago | Smart Define. 1970. "in-box thesaurus" https://smartdefine.org/in-box/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 1970, in-box thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/in-box/thesaurus/synonyms>. |
| MLA | Smart Define. "in-box thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/in-box/thesaurus/synonyms> |