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