(a.) Thirteen.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). thretteen. Retrieved September 30, 2026, from http://smartdefine.org/thretteen/definitions/2072339 |
| Chicago | Webster's. 2011. "thretteen" http://smartdefine.org/thretteen/definitions/2072339 (accessed September 30, 2026). |
| Harvard | Webster's 2011, thretteen, Smart Define, viewed 30 September, 2026, <http://smartdefine.org/thretteen/definitions/2072339>. |
| MLA | Webster's. "thretteen" 28 May 2011. Web. 30 September 2026. <http://smartdefine.org/thretteen/definitions/2072339> |