| APA | UPUO. (2012, February 15). In Acronym Geek. Retrieved 12:45, February 15, 2012, from http://www.acronymgeek.com/UPUO |
| MLA | "UPUO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/UPUO>. |
| MHRA | 'UPUO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/UPUO> [accessed 15 February 2012] |
| Chicago | "UPUO", http://www.acronymgeek.com/UPUO (accessed February 15, 2012). |
| CBE/CSE | UPUO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/UPUO. |
| Bluebook | UPUO, http://www.acronymgeek.com/UPUO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UPUO, http://www.acronymgeek.com/UPUO (optional description here) (as of Feb. 15, 2012, 12:45). |
| AMA | UPUO. Acronym Geek. February 15, 2012, 12:45. Available at: http://www.acronymgeek.com/UPUO. Accessed February 15, 2012, 12:45. |