| APA | CI/O. (2012, February 12). In Acronym Geek. Retrieved 08:55, February 12, 2012, from http://www.acronymgeek.com/CI/O |
| MLA | "CI/O." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/CI/O>. |
| MHRA | 'CI/O', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/CI/O> [accessed 12 February 2012] |
| Chicago | "CI/O", http://www.acronymgeek.com/CI/O (accessed February 12, 2012). |
| CBE/CSE | CI/O [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/CI/O. |
| Bluebook | CI/O, http://www.acronymgeek.com/CI/O (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CI/O, http://www.acronymgeek.com/CI/O (optional description here) (as of Feb. 12, 2012, 08:55). |
| AMA | CI/O. Acronym Geek. February 12, 2012, 08:55. Available at: http://www.acronymgeek.com/CI/O. Accessed February 12, 2012, 08:55. |