| APA | Smart Define. (2013). lean coal thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/lean_coal/thesaurus/related |
| Chicago | Smart Define. 2013. "lean coal thesaurus" https://smartdefine.org/lean_coal/thesaurus/related (accessed September 24, 2026). |
| Harvard | Smart Define 2013, lean coal thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/lean_coal/thesaurus/related>. |
| MLA | Smart Define. "lean coal thesaurus" 17 May 2013. Web. 24 September 2026. <https://smartdefine.org/lean_coal/thesaurus/related> |