| APA | Smart Define. (2013). passenger stairway tunnel thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/passenger_stairway_tunnel/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "passenger stairway tunnel thesaurus" https://smartdefine.org/passenger_stairway_tunnel/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2013, passenger stairway tunnel thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/passenger_stairway_tunnel/thesaurus/synonyms>. |
| MLA | Smart Define. "passenger stairway tunnel thesaurus" 18 May 2013. Web. 28 September 2026. <https://smartdefine.org/passenger_stairway_tunnel/thesaurus/synonyms> |