Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). thwack. Retrieved September 21, 2026, from http://smartdefine.org/thwack/definitions/2072494 |
| Chicago | Webster's. 2011. "thwack" http://smartdefine.org/thwack/definitions/2072494 (accessed September 21, 2026). |
| Harvard | Webster's 2011, thwack, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/thwack/definitions/2072494>. |
| MLA | Webster's. "thwack" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/thwack/definitions/2072494> |