| APA | OIS. (2012, February 9). In Acronym Geek. Retrieved 20:51, February 9, 2012, from http://www.acronymgeek.com/OIS |
| MLA | "OIS." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/OIS>. |
| MHRA | 'OIS', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/OIS> [accessed 9 February 2012] |
| Chicago | "OIS", http://www.acronymgeek.com/OIS (accessed February 9, 2012). |
| CBE/CSE | OIS [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/OIS. |
| Bluebook | OIS, http://www.acronymgeek.com/OIS (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OIS, http://www.acronymgeek.com/OIS (optional description here) (as of Feb. 9, 2012, 20:51). |
| AMA | OIS. Acronym Geek. February 9, 2012, 20:51. Available at: http://www.acronymgeek.com/OIS. Accessed February 9, 2012, 20:51. |