| APA | NPN. (2012, February 14). In Acronym Geek. Retrieved 11:29, February 14, 2012, from http://www.acronymgeek.com/NPN |
| MLA | "NPN." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/NPN>. |
| MHRA | 'NPN', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/NPN> [accessed 14 February 2012] |
| Chicago | "NPN", http://www.acronymgeek.com/NPN (accessed February 14, 2012). |
| CBE/CSE | NPN [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/NPN. |
| Bluebook | NPN, http://www.acronymgeek.com/NPN (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPN, http://www.acronymgeek.com/NPN (optional description here) (as of Feb. 14, 2012, 11:29). |
| AMA | NPN. Acronym Geek. February 14, 2012, 11:29. Available at: http://www.acronymgeek.com/NPN. Accessed February 14, 2012, 11:29. |