| APA | USN. (2012, February 9). In Acronym Geek. Retrieved 20:46, February 9, 2012, from http://www.acronymgeek.com/USN |
| MLA | "USN." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/USN>. |
| MHRA | 'USN', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/USN> [accessed 9 February 2012] |
| Chicago | "USN", http://www.acronymgeek.com/USN (accessed February 9, 2012). |
| CBE/CSE | USN [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/USN. |
| Bluebook | USN, http://www.acronymgeek.com/USN (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, USN, http://www.acronymgeek.com/USN (optional description here) (as of Feb. 9, 2012, 20:46). |
| AMA | USN. Acronym Geek. February 9, 2012, 20:46. Available at: http://www.acronymgeek.com/USN. Accessed February 9, 2012, 20:46. |