| APA | OU. (2012, February 10). In Acronym Geek. Retrieved 07:24, February 10, 2012, from http://www.acronymgeek.com/OU |
| MLA | "OU." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/OU>. |
| MHRA | 'OU', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/OU> [accessed 10 February 2012] |
| Chicago | "OU", http://www.acronymgeek.com/OU (accessed February 10, 2012). |
| CBE/CSE | OU [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/OU. |
| Bluebook | OU, http://www.acronymgeek.com/OU (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OU, http://www.acronymgeek.com/OU (optional description here) (as of Feb. 10, 2012, 07:24). |
| AMA | OU. Acronym Geek. February 10, 2012, 07:24. Available at: http://www.acronymgeek.com/OU. Accessed February 10, 2012, 07:24. |