| APA | OEIL. (2012, February 16). In Acronym Geek. Retrieved 04:36, February 16, 2012, from http://www.acronymgeek.com/OEIL |
| MLA | "OEIL." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OEIL>. |
| MHRA | 'OEIL', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OEIL> [accessed 16 February 2012] |
| Chicago | "OEIL", http://www.acronymgeek.com/OEIL (accessed February 16, 2012). |
| CBE/CSE | OEIL [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OEIL. |
| Bluebook | OEIL, http://www.acronymgeek.com/OEIL (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OEIL, http://www.acronymgeek.com/OEIL (optional description here) (as of Feb. 16, 2012, 04:36). |
| AMA | OEIL. Acronym Geek. February 16, 2012, 04:36. Available at: http://www.acronymgeek.com/OEIL. Accessed February 16, 2012, 04:36. |