Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). collum. Retrieved September 24, 2026, from http://smartdefine.org/collum/definitions/1989073 |
| Chicago | Webster's. 2011. "collum" http://smartdefine.org/collum/definitions/1989073 (accessed September 24, 2026). |
| Harvard | Webster's 2011, collum, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/collum/definitions/1989073>. |
| MLA | Webster's. "collum" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/collum/definitions/1989073> |