| APA | URDN. (2012, February 16). In Acronym Geek. Retrieved 03:23, February 16, 2012, from http://www.acronymgeek.com/URDN |
| MLA | "URDN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/URDN>. |
| MHRA | 'URDN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/URDN> [accessed 16 February 2012] |
| Chicago | "URDN", http://www.acronymgeek.com/URDN (accessed February 16, 2012). |
| CBE/CSE | URDN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/URDN. |
| Bluebook | URDN, http://www.acronymgeek.com/URDN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, URDN, http://www.acronymgeek.com/URDN (optional description here) (as of Feb. 16, 2012, 03:23). |
| AMA | URDN. Acronym Geek. February 16, 2012, 03:23. Available at: http://www.acronymgeek.com/URDN. Accessed February 16, 2012, 03:23. |