| APA | COP. (2012, February 9). In Acronym Geek. Retrieved 19:59, February 9, 2012, from http://www.acronymgeek.com/COP |
| MLA | "COP." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/COP>. |
| MHRA | 'COP', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/COP> [accessed 9 February 2012] |
| Chicago | "COP", http://www.acronymgeek.com/COP (accessed February 9, 2012). |
| CBE/CSE | COP [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/COP. |
| Bluebook | COP, http://www.acronymgeek.com/COP (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, COP, http://www.acronymgeek.com/COP (optional description here) (as of Feb. 9, 2012, 19:59). |
| AMA | COP. Acronym Geek. February 9, 2012, 19:59. Available at: http://www.acronymgeek.com/COP. Accessed February 9, 2012, 19:59. |