| APA | Smart Define. (2011). included in a mailing thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/included_in_a_mailing/thesaurus/narrower |
| Chicago | Smart Define. 2011. "included in a mailing thesaurus" https://smartdefine.org/included_in_a_mailing/thesaurus/narrower (accessed September 22, 2026). |
| Harvard | Smart Define 2011, included in a mailing thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/included_in_a_mailing/thesaurus/narrower>. |
| MLA | Smart Define. "included in a mailing thesaurus" 1 May 2011. Web. 22 September 2026. <https://smartdefine.org/included_in_a_mailing/thesaurus/narrower> |