| APA | CK. (2012, February 9). In Acronym Geek. Retrieved 18:07, February 9, 2012, from http://www.acronymgeek.com/CK |
| MLA | "CK." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/CK>. |
| MHRA | 'CK', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/CK> [accessed 9 February 2012] |
| Chicago | "CK", http://www.acronymgeek.com/CK (accessed February 9, 2012). |
| CBE/CSE | CK [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/CK. |
| Bluebook | CK, http://www.acronymgeek.com/CK (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CK, http://www.acronymgeek.com/CK (optional description here) (as of Feb. 9, 2012, 18:07). |
| AMA | CK. Acronym Geek. February 9, 2012, 18:07. Available at: http://www.acronymgeek.com/CK. Accessed February 9, 2012, 18:07. |