Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). nigrine. Retrieved October 2, 2026, from http://smartdefine.org/nigrine/definitions/2036756 |
| Chicago | Webster's. 2011. "nigrine" http://smartdefine.org/nigrine/definitions/2036756 (accessed October 2, 2026). |
| Harvard | Webster's 2011, nigrine, Smart Define, viewed 2 October, 2026, <http://smartdefine.org/nigrine/definitions/2036756>. |
| MLA | Webster's. "nigrine" 27 May 2011. Web. 2 October 2026. <http://smartdefine.org/nigrine/definitions/2036756> |