| APA | URDI. (2012, February 15). In Acronym Geek. Retrieved 06:54, February 15, 2012, from http://www.acronymgeek.com/URDI |
| MLA | "URDI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/URDI>. |
| MHRA | 'URDI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/URDI> [accessed 15 February 2012] |
| Chicago | "URDI", http://www.acronymgeek.com/URDI (accessed February 15, 2012). |
| CBE/CSE | URDI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/URDI. |
| Bluebook | URDI, http://www.acronymgeek.com/URDI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, URDI, http://www.acronymgeek.com/URDI (optional description here) (as of Feb. 15, 2012, 06:54). |
| AMA | URDI. Acronym Geek. February 15, 2012, 06:54. Available at: http://www.acronymgeek.com/URDI. Accessed February 15, 2012, 06:54. |