(p.pr.&vb.n.) of Duff.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). duffing. Retrieved September 21, 2026, from http://smartdefine.org/duffing/definitions/2000898 |
| Chicago | Webster's. 2011. "duffing" http://smartdefine.org/duffing/definitions/2000898 (accessed September 21, 2026). |
| Harvard | Webster's 2011, duffing, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/duffing/definitions/2000898>. |
| MLA | Webster's. "duffing" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/duffing/definitions/2000898> |