(a.) Same as Surd, a., 3.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). surdal. Retrieved September 23, 2026, from http://smartdefine.org/surdal/definitions/2068968 |
| Chicago | Webster's. 2011. "surdal" http://smartdefine.org/surdal/definitions/2068968 (accessed September 23, 2026). |
| Harvard | Webster's 2011, surdal, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/surdal/definitions/2068968>. |
| MLA | Webster's. "surdal" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/surdal/definitions/2068968> |