| APA | K4Y. (2012, February 12). In Acronym Geek. Retrieved 07:06, February 12, 2012, from http://www.acronymgeek.com/K4Y |
| MLA | "K4Y." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/K4Y>. |
| MHRA | 'K4Y', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/K4Y> [accessed 12 February 2012] |
| Chicago | "K4Y", http://www.acronymgeek.com/K4Y (accessed February 12, 2012). |
| CBE/CSE | K4Y [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/K4Y. |
| Bluebook | K4Y, http://www.acronymgeek.com/K4Y (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, K4Y, http://www.acronymgeek.com/K4Y (optional description here) (as of Feb. 12, 2012, 07:06). |
| AMA | K4Y. Acronym Geek. February 12, 2012, 07:06. Available at: http://www.acronymgeek.com/K4Y. Accessed February 12, 2012, 07:06. |