| APA | Smart Define. (1970). eco tourism thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/eco_tourism/thesaurus/related |
| Chicago | Smart Define. 1970. "eco tourism thesaurus" https://smartdefine.org/eco_tourism/thesaurus/related (accessed September 28, 2026). |
| Harvard | Smart Define 1970, eco tourism thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/eco_tourism/thesaurus/related>. |
| MLA | Smart Define. "eco tourism thesaurus" 1 January 1970. Web. 28 September 2026. <https://smartdefine.org/eco_tourism/thesaurus/related> |