(p.pr.&vb.n.) of Tunnel.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). tunneling. Retrieved September 20, 2026, from http://smartdefine.org/tunneling/definitions/2075492 |
| Chicago | Webster's. 2011. "tunneling" http://smartdefine.org/tunneling/definitions/2075492 (accessed September 20, 2026). |
| Harvard | Webster's 2011, tunneling, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/tunneling/definitions/2075492>. |
| MLA | Webster's. "tunneling" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/tunneling/definitions/2075492> |