| APA | OSEI. (2012, February 15). In Acronym Geek. Retrieved 22:58, February 15, 2012, from http://www.acronymgeek.com/OSEI |
| MLA | "OSEI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OSEI>. |
| MHRA | 'OSEI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OSEI> [accessed 15 February 2012] |
| Chicago | "OSEI", http://www.acronymgeek.com/OSEI (accessed February 15, 2012). |
| CBE/CSE | OSEI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OSEI. |
| Bluebook | OSEI, http://www.acronymgeek.com/OSEI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OSEI, http://www.acronymgeek.com/OSEI (optional description here) (as of Feb. 15, 2012, 22:58). |
| AMA | OSEI. Acronym Geek. February 15, 2012, 22:58. Available at: http://www.acronymgeek.com/OSEI. Accessed February 15, 2012, 22:58. |