Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). purpura. Retrieved September 30, 2026, from http://smartdefine.org/purpura/definitions/2051124 |
| Chicago | Webster's. 2011. "purpura" http://smartdefine.org/purpura/definitions/2051124 (accessed September 30, 2026). |
| Harvard | Webster's 2011, purpura, Smart Define, viewed 30 September, 2026, <http://smartdefine.org/purpura/definitions/2051124>. |
| MLA | Webster's. "purpura" 27 May 2011. Web. 30 September 2026. <http://smartdefine.org/purpura/definitions/2051124> |