| APA | Smart Define. (2013). trolleybus thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/trolleybus/thesaurus/broader |
| Chicago | Smart Define. 2013. "trolleybus thesaurus" https://smartdefine.org/trolleybus/thesaurus/broader (accessed September 24, 2026). |
| Harvard | Smart Define 2013, trolleybus thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/trolleybus/thesaurus/broader>. |
| MLA | Smart Define. "trolleybus thesaurus" 18 May 2013. Web. 24 September 2026. <https://smartdefine.org/trolleybus/thesaurus/broader> |