| APA | 9O. (2012, February 11). In Acronym Geek. Retrieved 10:30, February 11, 2012, from http://www.acronymgeek.com/9O |
| MLA | "9O." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/9O>. |
| MHRA | '9O', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/9O> [accessed 11 February 2012] |
| Chicago | "9O", http://www.acronymgeek.com/9O (accessed February 11, 2012). |
| CBE/CSE | 9O [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/9O. |
| Bluebook | 9O, http://www.acronymgeek.com/9O (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 9O, http://www.acronymgeek.com/9O (optional description here) (as of Feb. 11, 2012, 10:30). |
| AMA | 9O. Acronym Geek. February 11, 2012, 10:30. Available at: http://www.acronymgeek.com/9O. Accessed February 11, 2012, 10:30. |