| APA | OCOS. (2012, February 16). In Acronym Geek. Retrieved 22:08, February 16, 2012, from http://www.acronymgeek.com/OCOS |
| MLA | "OCOS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OCOS>. |
| MHRA | 'OCOS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OCOS> [accessed 16 February 2012] |
| Chicago | "OCOS", http://www.acronymgeek.com/OCOS (accessed February 16, 2012). |
| CBE/CSE | OCOS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OCOS. |
| Bluebook | OCOS, http://www.acronymgeek.com/OCOS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OCOS, http://www.acronymgeek.com/OCOS (optional description here) (as of Feb. 16, 2012, 22:08). |
| AMA | OCOS. Acronym Geek. February 16, 2012, 22:08. Available at: http://www.acronymgeek.com/OCOS. Accessed February 16, 2012, 22:08. |