| APA | NPNO. (2012, February 16). In Acronym Geek. Retrieved 20:49, February 16, 2012, from http://www.acronymgeek.com/NPNO |
| MLA | "NPNO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/NPNO>. |
| MHRA | 'NPNO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/NPNO> [accessed 16 February 2012] |
| Chicago | "NPNO", http://www.acronymgeek.com/NPNO (accessed February 16, 2012). |
| CBE/CSE | NPNO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/NPNO. |
| Bluebook | NPNO, http://www.acronymgeek.com/NPNO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPNO, http://www.acronymgeek.com/NPNO (optional description here) (as of Feb. 16, 2012, 20:49). |
| AMA | NPNO. Acronym Geek. February 16, 2012, 20:49. Available at: http://www.acronymgeek.com/NPNO. Accessed February 16, 2012, 20:49. |