| APA | CIOP. (2012, February 11). In Acronym Geek. Retrieved 17:13, February 11, 2012, from http://www.acronymgeek.com/CIOP |
| MLA | "CIOP." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/CIOP>. |
| MHRA | 'CIOP', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/CIOP> [accessed 11 February 2012] |
| Chicago | "CIOP", http://www.acronymgeek.com/CIOP (accessed February 11, 2012). |
| CBE/CSE | CIOP [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/CIOP. |
| Bluebook | CIOP, http://www.acronymgeek.com/CIOP (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CIOP, http://www.acronymgeek.com/CIOP (optional description here) (as of Feb. 11, 2012, 17:13). |
| AMA | CIOP. Acronym Geek. February 11, 2012, 17:13. Available at: http://www.acronymgeek.com/CIOP. Accessed February 11, 2012, 17:13. |