| APA | XTR. (2012, February 13). In Acronym Geek. Retrieved 23:10, February 13, 2012, from http://www.acronymgeek.com/XTR |
| MLA | "XTR." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/XTR>. |
| MHRA | 'XTR', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/XTR> [accessed 13 February 2012] |
| Chicago | "XTR", http://www.acronymgeek.com/XTR (accessed February 13, 2012). |
| CBE/CSE | XTR [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/XTR. |
| Bluebook | XTR, http://www.acronymgeek.com/XTR (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XTR, http://www.acronymgeek.com/XTR (optional description here) (as of Feb. 13, 2012, 23:10). |
| AMA | XTR. Acronym Geek. February 13, 2012, 23:10. Available at: http://www.acronymgeek.com/XTR. Accessed February 13, 2012, 23:10. |