| APA | UDIN. (2012, February 15). In Acronym Geek. Retrieved 18:27, February 15, 2012, from http://www.acronymgeek.com/UDIN |
| MLA | "UDIN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/UDIN>. |
| MHRA | 'UDIN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/UDIN> [accessed 15 February 2012] |
| Chicago | "UDIN", http://www.acronymgeek.com/UDIN (accessed February 15, 2012). |
| CBE/CSE | UDIN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/UDIN. |
| Bluebook | UDIN, http://www.acronymgeek.com/UDIN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UDIN, http://www.acronymgeek.com/UDIN (optional description here) (as of Feb. 15, 2012, 18:27). |
| AMA | UDIN. Acronym Geek. February 15, 2012, 18:27. Available at: http://www.acronymgeek.com/UDIN. Accessed February 15, 2012, 18:27. |