| APA | OE. (2012, February 14). In Acronym Geek. Retrieved 06:15, February 14, 2012, from http://www.acronymgeek.com/OE |
| MLA | "OE." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OE>. |
| MHRA | 'OE', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OE> [accessed 14 February 2012] |
| Chicago | "OE", http://www.acronymgeek.com/OE (accessed February 14, 2012). |
| CBE/CSE | OE [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OE. |
| Bluebook | OE, http://www.acronymgeek.com/OE (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OE, http://www.acronymgeek.com/OE (optional description here) (as of Feb. 14, 2012, 06:15). |
| AMA | OE. Acronym Geek. February 14, 2012, 06:15. Available at: http://www.acronymgeek.com/OE. Accessed February 14, 2012, 06:15. |