| APA | XK. (2012, February 10). In Acronym Geek. Retrieved 10:15, February 10, 2012, from http://www.acronymgeek.com/XK |
| MLA | "XK." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/XK>. |
| MHRA | 'XK', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/XK> [accessed 10 February 2012] |
| Chicago | "XK", http://www.acronymgeek.com/XK (accessed February 10, 2012). |
| CBE/CSE | XK [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/XK. |
| Bluebook | XK, http://www.acronymgeek.com/XK (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XK, http://www.acronymgeek.com/XK (optional description here) (as of Feb. 10, 2012, 10:15). |
| AMA | XK. Acronym Geek. February 10, 2012, 10:15. Available at: http://www.acronymgeek.com/XK. Accessed February 10, 2012, 10:15. |