| APA | XK. (2012, February 11). In Acronym Geek. Retrieved 21:50, February 11, 2012, from http://www.acronymgeek.com/XK |
| MLA | "XK." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/XK>. |
| MHRA | 'XK', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/XK> [accessed 11 February 2012] |
| Chicago | "XK", http://www.acronymgeek.com/XK (accessed February 11, 2012). |
| CBE/CSE | XK [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/XK. |
| Bluebook | XK, http://www.acronymgeek.com/XK (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XK, http://www.acronymgeek.com/XK (optional description here) (as of Feb. 11, 2012, 21:50). |
| AMA | XK. Acronym Geek. February 11, 2012, 21:50. Available at: http://www.acronymgeek.com/XK. Accessed February 11, 2012, 21:50. |