| APA | Smart Define. (2015). mail-order selling thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/mail-order_selling/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "mail-order selling thesaurus" https://smartdefine.org/mail-order_selling/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, mail-order selling thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/mail-order_selling/thesaurus/synonyms>. |
| MLA | Smart Define. "mail-order selling thesaurus" 13 April 2015. Web. 29 September 2026. <https://smartdefine.org/mail-order_selling/thesaurus/synonyms> |