| APA | N4. (2012, February 11). In Acronym Geek. Retrieved 21:55, February 11, 2012, from http://www.acronymgeek.com/N4 |
| MLA | "N4." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/N4>. |
| MHRA | 'N4', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/N4> [accessed 11 February 2012] |
| Chicago | "N4", http://www.acronymgeek.com/N4 (accessed February 11, 2012). |
| CBE/CSE | N4 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/N4. |
| Bluebook | N4, http://www.acronymgeek.com/N4 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, N4, http://www.acronymgeek.com/N4 (optional description here) (as of Feb. 11, 2012, 21:55). |
| AMA | N4. Acronym Geek. February 11, 2012, 21:55. Available at: http://www.acronymgeek.com/N4. Accessed February 11, 2012, 21:55. |