| APA | OOA. (2012, February 9). In Acronym Geek. Retrieved 10:09, February 9, 2012, from http://www.acronymgeek.com/OOA |
| MLA | "OOA." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/OOA>. |
| MHRA | 'OOA', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/OOA> [accessed 9 February 2012] |
| Chicago | "OOA", http://www.acronymgeek.com/OOA (accessed February 9, 2012). |
| CBE/CSE | OOA [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/OOA. |
| Bluebook | OOA, http://www.acronymgeek.com/OOA (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OOA, http://www.acronymgeek.com/OOA (optional description here) (as of Feb. 9, 2012, 10:09). |
| AMA | OOA. Acronym Geek. February 9, 2012, 10:09. Available at: http://www.acronymgeek.com/OOA. Accessed February 9, 2012, 10:09. |