| APA | Smart Define. (1970). cell surface immune checkpoint antigen thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/cell_surface_immune_checkpoint_antigen/thesaurus/broader |
| Chicago | Smart Define. 1970. "cell surface immune checkpoint antigen thesaurus" https://smartdefine.org/cell_surface_immune_checkpoint_antigen/thesaurus/broader (accessed September 22, 2026). |
| Harvard | Smart Define 1970, cell surface immune checkpoint antigen thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/cell_surface_immune_checkpoint_antigen/thesaurus/broader>. |
| MLA | Smart Define. "cell surface immune checkpoint antigen thesaurus" 1 January 1970. Web. 22 September 2026. <https://smartdefine.org/cell_surface_immune_checkpoint_antigen/thesaurus/broader> |