| APA | XIS. (2012, February 11). In Acronym Geek. Retrieved 17:07, February 11, 2012, from http://www.acronymgeek.com/XIS |
| MLA | "XIS." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/XIS>. |
| MHRA | 'XIS', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/XIS> [accessed 11 February 2012] |
| Chicago | "XIS", http://www.acronymgeek.com/XIS (accessed February 11, 2012). |
| CBE/CSE | XIS [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/XIS. |
| Bluebook | XIS, http://www.acronymgeek.com/XIS (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XIS, http://www.acronymgeek.com/XIS (optional description here) (as of Feb. 11, 2012, 17:07). |
| AMA | XIS. Acronym Geek. February 11, 2012, 17:07. Available at: http://www.acronymgeek.com/XIS. Accessed February 11, 2012, 17:07. |