| APA | Smart Define. (1970). journey to the end of coal thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/journey_to_the_end_of_coal/thesaurus/broader |
| Chicago | Smart Define. 1970. "journey to the end of coal thesaurus" https://smartdefine.org/journey_to_the_end_of_coal/thesaurus/broader (accessed September 29, 2026). |
| Harvard | Smart Define 1970, journey to the end of coal thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/journey_to_the_end_of_coal/thesaurus/broader>. |
| MLA | Smart Define. "journey to the end of coal thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/journey_to_the_end_of_coal/thesaurus/broader> |