| APA | XI. (2012, February 10). In Acronym Geek. Retrieved 09:38, February 10, 2012, from http://www.acronymgeek.com/XI |
| MLA | "XI." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/XI>. |
| MHRA | 'XI', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/XI> [accessed 10 February 2012] |
| Chicago | "XI", http://www.acronymgeek.com/XI (accessed February 10, 2012). |
| CBE/CSE | XI [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/XI. |
| Bluebook | XI, http://www.acronymgeek.com/XI (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XI, http://www.acronymgeek.com/XI (optional description here) (as of Feb. 10, 2012, 09:38). |
| AMA | XI. Acronym Geek. February 10, 2012, 09:38. Available at: http://www.acronymgeek.com/XI. Accessed February 10, 2012, 09:38. |