| APA | NIU. (2012, February 10). In Acronym Geek. Retrieved 11:00, February 10, 2012, from http://www.acronymgeek.com/NIU |
| MLA | "NIU." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/NIU>. |
| MHRA | 'NIU', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/NIU> [accessed 10 February 2012] |
| Chicago | "NIU", http://www.acronymgeek.com/NIU (accessed February 10, 2012). |
| CBE/CSE | NIU [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/NIU. |
| Bluebook | NIU, http://www.acronymgeek.com/NIU (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NIU, http://www.acronymgeek.com/NIU (optional description here) (as of Feb. 10, 2012, 11:00). |
| AMA | NIU. Acronym Geek. February 10, 2012, 11:00. Available at: http://www.acronymgeek.com/NIU. Accessed February 10, 2012, 11:00. |