| APA | ORNA. (2012, February 15). In Acronym Geek. Retrieved 11:22, February 15, 2012, from http://www.acronymgeek.com/ORNA |
| MLA | "ORNA." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/ORNA>. |
| MHRA | 'ORNA', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/ORNA> [accessed 15 February 2012] |
| Chicago | "ORNA", http://www.acronymgeek.com/ORNA (accessed February 15, 2012). |
| CBE/CSE | ORNA [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/ORNA. |
| Bluebook | ORNA, http://www.acronymgeek.com/ORNA (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ORNA, http://www.acronymgeek.com/ORNA (optional description here) (as of Feb. 15, 2012, 11:22). |
| AMA | ORNA. Acronym Geek. February 15, 2012, 11:22. Available at: http://www.acronymgeek.com/ORNA. Accessed February 15, 2012, 11:22. |