| APA | U. (2012, February 9). In Acronym Geek. Retrieved 08:56, February 9, 2012, from http://www.acronymgeek.com/U |
| MLA | "U." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/U>. |
| MHRA | 'U', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/U> [accessed 9 February 2012] |
| Chicago | "U", http://www.acronymgeek.com/U (accessed February 9, 2012). |
| CBE/CSE | U [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/U. |
| Bluebook | U, http://www.acronymgeek.com/U (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, U, http://www.acronymgeek.com/U (optional description here) (as of Feb. 9, 2012, 08:56). |
| AMA | U. Acronym Geek. February 9, 2012, 08:56. Available at: http://www.acronymgeek.com/U. Accessed February 9, 2012, 08:56. |