| APA | UNDD. (2012, February 15). In Acronym Geek. Retrieved 09:12, February 15, 2012, from http://www.acronymgeek.com/UNDD |
| MLA | "UNDD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/UNDD>. |
| MHRA | 'UNDD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/UNDD> [accessed 15 February 2012] |
| Chicago | "UNDD", http://www.acronymgeek.com/UNDD (accessed February 15, 2012). |
| CBE/CSE | UNDD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/UNDD. |
| Bluebook | UNDD, http://www.acronymgeek.com/UNDD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UNDD, http://www.acronymgeek.com/UNDD (optional description here) (as of Feb. 15, 2012, 09:12). |
| AMA | UNDD. Acronym Geek. February 15, 2012, 09:12. Available at: http://www.acronymgeek.com/UNDD. Accessed February 15, 2012, 09:12. |