| APA | XOI. (2012, February 14). In Acronym Geek. Retrieved 11:07, February 14, 2012, from http://www.acronymgeek.com/XOI |
| MLA | "XOI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/XOI>. |
| MHRA | 'XOI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/XOI> [accessed 14 February 2012] |
| Chicago | "XOI", http://www.acronymgeek.com/XOI (accessed February 14, 2012). |
| CBE/CSE | XOI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/XOI. |
| Bluebook | XOI, http://www.acronymgeek.com/XOI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XOI, http://www.acronymgeek.com/XOI (optional description here) (as of Feb. 14, 2012, 11:07). |
| AMA | XOI. Acronym Geek. February 14, 2012, 11:07. Available at: http://www.acronymgeek.com/XOI. Accessed February 14, 2012, 11:07. |