| APA | CLK. (2012, February 14). In Acronym Geek. Retrieved 19:41, February 14, 2012, from http://www.acronymgeek.com/CLK |
| MLA | "CLK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/CLK>. |
| MHRA | 'CLK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/CLK> [accessed 14 February 2012] |
| Chicago | "CLK", http://www.acronymgeek.com/CLK (accessed February 14, 2012). |
| CBE/CSE | CLK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/CLK. |
| Bluebook | CLK, http://www.acronymgeek.com/CLK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CLK, http://www.acronymgeek.com/CLK (optional description here) (as of Feb. 14, 2012, 19:41). |
| AMA | CLK. Acronym Geek. February 14, 2012, 19:41. Available at: http://www.acronymgeek.com/CLK. Accessed February 14, 2012, 19:41. |