| APA | XNU. (2012, February 14). In Acronym Geek. Retrieved 07:41, February 14, 2012, from http://www.acronymgeek.com/XNU |
| MLA | "XNU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/XNU>. |
| MHRA | 'XNU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/XNU> [accessed 14 February 2012] |
| Chicago | "XNU", http://www.acronymgeek.com/XNU (accessed February 14, 2012). |
| CBE/CSE | XNU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/XNU. |
| Bluebook | XNU, http://www.acronymgeek.com/XNU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XNU, http://www.acronymgeek.com/XNU (optional description here) (as of Feb. 14, 2012, 07:41). |
| AMA | XNU. Acronym Geek. February 14, 2012, 07:41. Available at: http://www.acronymgeek.com/XNU. Accessed February 14, 2012, 07:41. |