| APA | Smart Define. (2015). grade crossing thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/grade_crossing/thesaurus/broader |
| Chicago | Smart Define. 2015. "grade crossing thesaurus" https://smartdefine.org/grade_crossing/thesaurus/broader (accessed September 21, 2026). |
| Harvard | Smart Define 2015, grade crossing thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/grade_crossing/thesaurus/broader>. |
| MLA | Smart Define. "grade crossing thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/grade_crossing/thesaurus/broader> |