| APA | OIRO. (2012, February 15). In Acronym Geek. Retrieved 06:59, February 15, 2012, from http://www.acronymgeek.com/OIRO |
| MLA | "OIRO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OIRO>. |
| MHRA | 'OIRO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OIRO> [accessed 15 February 2012] |
| Chicago | "OIRO", http://www.acronymgeek.com/OIRO (accessed February 15, 2012). |
| CBE/CSE | OIRO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OIRO. |
| Bluebook | OIRO, http://www.acronymgeek.com/OIRO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OIRO, http://www.acronymgeek.com/OIRO (optional description here) (as of Feb. 15, 2012, 06:59). |
| AMA | OIRO. Acronym Geek. February 15, 2012, 06:59. Available at: http://www.acronymgeek.com/OIRO. Accessed February 15, 2012, 06:59. |