| APA | OEII. (2012, February 15). In Acronym Geek. Retrieved 01:40, February 15, 2012, from http://www.acronymgeek.com/OEII |
| MLA | "OEII." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OEII>. |
| MHRA | 'OEII', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OEII> [accessed 15 February 2012] |
| Chicago | "OEII", http://www.acronymgeek.com/OEII (accessed February 15, 2012). |
| CBE/CSE | OEII [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OEII. |
| Bluebook | OEII, http://www.acronymgeek.com/OEII (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OEII, http://www.acronymgeek.com/OEII (optional description here) (as of Feb. 15, 2012, 01:40). |
| AMA | OEII. Acronym Geek. February 15, 2012, 01:40. Available at: http://www.acronymgeek.com/OEII. Accessed February 15, 2012, 01:40. |