| APA | Smart Define. (1970). birthday-based biorhythm thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/birthday-based_biorhythm/thesaurus/broader |
| Chicago | Smart Define. 1970. "birthday-based biorhythm thesaurus" https://smartdefine.org/birthday-based_biorhythm/thesaurus/broader (accessed September 25, 2026). |
| Harvard | Smart Define 1970, birthday-based biorhythm thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/birthday-based_biorhythm/thesaurus/broader>. |
| MLA | Smart Define. "birthday-based biorhythm thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/birthday-based_biorhythm/thesaurus/broader> |