| APA | Smart Define. (1970). study of the stars and planets thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/study_of_the_stars_and_planets/thesaurus/narrower |
| Chicago | Smart Define. 1970. "study of the stars and planets thesaurus" https://smartdefine.org/study_of_the_stars_and_planets/thesaurus/narrower (accessed October 1, 2026). |
| Harvard | Smart Define 1970, study of the stars and planets thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/study_of_the_stars_and_planets/thesaurus/narrower>. |
| MLA | Smart Define. "study of the stars and planets thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/study_of_the_stars_and_planets/thesaurus/narrower> |