| APA | UOP. (2012, February 14). In Acronym Geek. Retrieved 09:53, February 14, 2012, from http://www.acronymgeek.com/UOP |
| MLA | "UOP." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/UOP>. |
| MHRA | 'UOP', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/UOP> [accessed 14 February 2012] |
| Chicago | "UOP", http://www.acronymgeek.com/UOP (accessed February 14, 2012). |
| CBE/CSE | UOP [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/UOP. |
| Bluebook | UOP, http://www.acronymgeek.com/UOP (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UOP, http://www.acronymgeek.com/UOP (optional description here) (as of Feb. 14, 2012, 09:53). |
| AMA | UOP. Acronym Geek. February 14, 2012, 09:53. Available at: http://www.acronymgeek.com/UOP. Accessed February 14, 2012, 09:53. |