| APA | Smart Define. (2013). mouldboard plough thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/mouldboard_plough/thesaurus/narrower |
| Chicago | Smart Define. 2013. "mouldboard plough thesaurus" https://smartdefine.org/mouldboard_plough/thesaurus/narrower (accessed September 29, 2026). |
| Harvard | Smart Define 2013, mouldboard plough thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/mouldboard_plough/thesaurus/narrower>. |
| MLA | Smart Define. "mouldboard plough thesaurus" 18 May 2013. Web. 29 September 2026. <https://smartdefine.org/mouldboard_plough/thesaurus/narrower> |