| APA | Smart Define. (2011). group pteridospermaphyta thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/group_pteridospermaphyta/thesaurus/broader |
| Chicago | Smart Define. 2011. "group pteridospermaphyta thesaurus" https://smartdefine.org/group_pteridospermaphyta/thesaurus/broader (accessed September 27, 2026). |
| Harvard | Smart Define 2011, group pteridospermaphyta thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/group_pteridospermaphyta/thesaurus/broader>. |
| MLA | Smart Define. "group pteridospermaphyta thesaurus" 26 April 2011. Web. 27 September 2026. <https://smartdefine.org/group_pteridospermaphyta/thesaurus/broader> |