| APA | XKO. (2012, February 14). In Acronym Geek. Retrieved 06:45, February 14, 2012, from http://www.acronymgeek.com/XKO |
| MLA | "XKO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/XKO>. |
| MHRA | 'XKO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/XKO> [accessed 14 February 2012] |
| Chicago | "XKO", http://www.acronymgeek.com/XKO (accessed February 14, 2012). |
| CBE/CSE | XKO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/XKO. |
| Bluebook | XKO, http://www.acronymgeek.com/XKO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XKO, http://www.acronymgeek.com/XKO (optional description here) (as of Feb. 14, 2012, 06:45). |
| AMA | XKO. Acronym Geek. February 14, 2012, 06:45. Available at: http://www.acronymgeek.com/XKO. Accessed February 14, 2012, 06:45. |