| APA | OIEL. (2012, February 14). In Acronym Geek. Retrieved 22:46, February 14, 2012, from http://www.acronymgeek.com/OIEL |
| MLA | "OIEL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OIEL>. |
| MHRA | 'OIEL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OIEL> [accessed 14 February 2012] |
| Chicago | "OIEL", http://www.acronymgeek.com/OIEL (accessed February 14, 2012). |
| CBE/CSE | OIEL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OIEL. |
| Bluebook | OIEL, http://www.acronymgeek.com/OIEL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OIEL, http://www.acronymgeek.com/OIEL (optional description here) (as of Feb. 14, 2012, 22:46). |
| AMA | OIEL. Acronym Geek. February 14, 2012, 22:46. Available at: http://www.acronymgeek.com/OIEL. Accessed February 14, 2012, 22:46. |