| APA | NPNG. (2012, February 11). In Acronym Geek. Retrieved 20:03, February 11, 2012, from http://www.acronymgeek.com/NPNG |
| MLA | "NPNG." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/NPNG>. |
| MHRA | 'NPNG', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/NPNG> [accessed 11 February 2012] |
| Chicago | "NPNG", http://www.acronymgeek.com/NPNG (accessed February 11, 2012). |
| CBE/CSE | NPNG [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/NPNG. |
| Bluebook | NPNG, http://www.acronymgeek.com/NPNG (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPNG, http://www.acronymgeek.com/NPNG (optional description here) (as of Feb. 11, 2012, 20:03). |
| AMA | NPNG. Acronym Geek. February 11, 2012, 20:03. Available at: http://www.acronymgeek.com/NPNG. Accessed February 11, 2012, 20:03. |