| APA | Smart Define. (2013). railroad track thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/railroad_track/thesaurus/narrower |
| Chicago | Smart Define. 2013. "railroad track thesaurus" https://smartdefine.org/railroad_track/thesaurus/narrower (accessed September 27, 2026). |
| Harvard | Smart Define 2013, railroad track thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/railroad_track/thesaurus/narrower>. |
| MLA | Smart Define. "railroad track thesaurus" 18 May 2013. Web. 27 September 2026. <https://smartdefine.org/railroad_track/thesaurus/narrower> |