| APA | CIOE. (2012, February 10). In Acronym Geek. Retrieved 10:29, February 10, 2012, from http://www.acronymgeek.com/CIOE |
| MLA | "CIOE." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/CIOE>. |
| MHRA | 'CIOE', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/CIOE> [accessed 10 February 2012] |
| Chicago | "CIOE", http://www.acronymgeek.com/CIOE (accessed February 10, 2012). |
| CBE/CSE | CIOE [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/CIOE. |
| Bluebook | CIOE, http://www.acronymgeek.com/CIOE (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CIOE, http://www.acronymgeek.com/CIOE (optional description here) (as of Feb. 10, 2012, 10:29). |
| AMA | CIOE. Acronym Geek. February 10, 2012, 10:29. Available at: http://www.acronymgeek.com/CIOE. Accessed February 10, 2012, 10:29. |