| APA | Smart Define. (2013). railroad retirement thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/railroad_retirement/thesaurus/broader |
| Chicago | Smart Define. 2013. "railroad retirement thesaurus" https://smartdefine.org/railroad_retirement/thesaurus/broader (accessed September 23, 2026). |
| Harvard | Smart Define 2013, railroad retirement thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/railroad_retirement/thesaurus/broader>. |
| MLA | Smart Define. "railroad retirement thesaurus" 13 June 2013. Web. 23 September 2026. <https://smartdefine.org/railroad_retirement/thesaurus/broader> |