| APA | CTK. (2012, February 14). In Acronym Geek. Retrieved 11:38, February 14, 2012, from http://www.acronymgeek.com/CTK |
| MLA | "CTK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/CTK>. |
| MHRA | 'CTK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/CTK> [accessed 14 February 2012] |
| Chicago | "CTK", http://www.acronymgeek.com/CTK (accessed February 14, 2012). |
| CBE/CSE | CTK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/CTK. |
| Bluebook | CTK, http://www.acronymgeek.com/CTK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CTK, http://www.acronymgeek.com/CTK (optional description here) (as of Feb. 14, 2012, 11:38). |
| AMA | CTK. Acronym Geek. February 14, 2012, 11:38. Available at: http://www.acronymgeek.com/CTK. Accessed February 14, 2012, 11:38. |