| APA | OOS. (2012, February 13). In Acronym Geek. Retrieved 23:24, February 13, 2012, from http://www.acronymgeek.com/OOS |
| MLA | "OOS." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/OOS>. |
| MHRA | 'OOS', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/OOS> [accessed 13 February 2012] |
| Chicago | "OOS", http://www.acronymgeek.com/OOS (accessed February 13, 2012). |
| CBE/CSE | OOS [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/OOS. |
| Bluebook | OOS, http://www.acronymgeek.com/OOS (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OOS, http://www.acronymgeek.com/OOS (optional description here) (as of Feb. 13, 2012, 23:24). |
| AMA | OOS. Acronym Geek. February 13, 2012, 23:24. Available at: http://www.acronymgeek.com/OOS. Accessed February 13, 2012, 23:24. |