Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Portman. Retrieved September 23, 2026, from http://smartdefine.org/portman/definitions/2047693 |
| Chicago | Webster's. 2011. "Portman" http://smartdefine.org/portman/definitions/2047693 (accessed September 23, 2026). |
| Harvard | Webster's 2011, Portman, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/portman/definitions/2047693>. |
| MLA | Webster's. "Portman" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/portman/definitions/2047693> |