| APA | OIEI. (2012, February 16). In Acronym Geek. Retrieved 01:05, February 16, 2012, from http://www.acronymgeek.com/OIEI |
| MLA | "OIEI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OIEI>. |
| MHRA | 'OIEI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OIEI> [accessed 16 February 2012] |
| Chicago | "OIEI", http://www.acronymgeek.com/OIEI (accessed February 16, 2012). |
| CBE/CSE | OIEI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OIEI. |
| Bluebook | OIEI, http://www.acronymgeek.com/OIEI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OIEI, http://www.acronymgeek.com/OIEI (optional description here) (as of Feb. 16, 2012, 01:05). |
| AMA | OIEI. Acronym Geek. February 16, 2012, 01:05. Available at: http://www.acronymgeek.com/OIEI. Accessed February 16, 2012, 01:05. |