| APA | CIOK. (2012, February 16). In Acronym Geek. Retrieved 23:24, February 16, 2012, from http://www.acronymgeek.com/CIOK |
| MLA | "CIOK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/CIOK>. |
| MHRA | 'CIOK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/CIOK> [accessed 16 February 2012] |
| Chicago | "CIOK", http://www.acronymgeek.com/CIOK (accessed February 16, 2012). |
| CBE/CSE | CIOK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/CIOK. |
| Bluebook | CIOK, http://www.acronymgeek.com/CIOK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CIOK, http://www.acronymgeek.com/CIOK (optional description here) (as of Feb. 16, 2012, 23:24). |
| AMA | CIOK. Acronym Geek. February 16, 2012, 23:24. Available at: http://www.acronymgeek.com/CIOK. Accessed February 16, 2012, 23:24. |