| APA | Smart Define. (1970). natural downhill course thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/natural_downhill_course/thesaurus/synonyms |
| Chicago | Smart Define. 1970. "natural downhill course thesaurus" https://smartdefine.org/natural_downhill_course/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 1970, natural downhill course thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/natural_downhill_course/thesaurus/synonyms>. |
| MLA | Smart Define. "natural downhill course thesaurus" 1 January 1970. Web. 20 September 2026. <https://smartdefine.org/natural_downhill_course/thesaurus/synonyms> |