| APA | XOK. (2012, February 14). In Acronym Geek. Retrieved 02:12, February 14, 2012, from http://www.acronymgeek.com/XOK |
| MLA | "XOK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/XOK>. |
| MHRA | 'XOK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/XOK> [accessed 14 February 2012] |
| Chicago | "XOK", http://www.acronymgeek.com/XOK (accessed February 14, 2012). |
| CBE/CSE | XOK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/XOK. |
| Bluebook | XOK, http://www.acronymgeek.com/XOK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XOK, http://www.acronymgeek.com/XOK (optional description here) (as of Feb. 14, 2012, 02:12). |
| AMA | XOK. Acronym Geek. February 14, 2012, 02:12. Available at: http://www.acronymgeek.com/XOK. Accessed February 14, 2012, 02:12. |