| APA | PUUO. (2012, February 16). In Acronym Geek. Retrieved 10:26, February 16, 2012, from http://www.acronymgeek.com/PUUO |
| MLA | "PUUO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PUUO>. |
| MHRA | 'PUUO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PUUO> [accessed 16 February 2012] |
| Chicago | "PUUO", http://www.acronymgeek.com/PUUO (accessed February 16, 2012). |
| CBE/CSE | PUUO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PUUO. |
| Bluebook | PUUO, http://www.acronymgeek.com/PUUO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PUUO, http://www.acronymgeek.com/PUUO (optional description here) (as of Feb. 16, 2012, 10:26). |
| AMA | PUUO. Acronym Geek. February 16, 2012, 10:26. Available at: http://www.acronymgeek.com/PUUO. Accessed February 16, 2012, 10:26. |