| APA | OENA. (2012, February 14). In Acronym Geek. Retrieved 21:06, February 14, 2012, from http://www.acronymgeek.com/OENA |
| MLA | "OENA." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OENA>. |
| MHRA | 'OENA', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OENA> [accessed 14 February 2012] |
| Chicago | "OENA", http://www.acronymgeek.com/OENA (accessed February 14, 2012). |
| CBE/CSE | OENA [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OENA. |
| Bluebook | OENA, http://www.acronymgeek.com/OENA (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OENA, http://www.acronymgeek.com/OENA (optional description here) (as of Feb. 14, 2012, 21:06). |
| AMA | OENA. Acronym Geek. February 14, 2012, 21:06. Available at: http://www.acronymgeek.com/OENA. Accessed February 14, 2012, 21:06. |