| APA | OA. (2012, February 14). In Acronym Geek. Retrieved 06:52, February 14, 2012, from http://www.acronymgeek.com/OA |
| MLA | "OA." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OA>. |
| MHRA | 'OA', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OA> [accessed 14 February 2012] |
| Chicago | "OA", http://www.acronymgeek.com/OA (accessed February 14, 2012). |
| CBE/CSE | OA [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OA. |
| Bluebook | OA, http://www.acronymgeek.com/OA (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OA, http://www.acronymgeek.com/OA (optional description here) (as of Feb. 14, 2012, 06:52). |
| AMA | OA. Acronym Geek. February 14, 2012, 06:52. Available at: http://www.acronymgeek.com/OA. Accessed February 14, 2012, 06:52. |