| APA | NPNL. (2012, February 11). In Acronym Geek. Retrieved 20:37, February 11, 2012, from http://www.acronymgeek.com/NPNL |
| MLA | "NPNL." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/NPNL>. |
| MHRA | 'NPNL', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/NPNL> [accessed 11 February 2012] |
| Chicago | "NPNL", http://www.acronymgeek.com/NPNL (accessed February 11, 2012). |
| CBE/CSE | NPNL [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/NPNL. |
| Bluebook | NPNL, http://www.acronymgeek.com/NPNL (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPNL, http://www.acronymgeek.com/NPNL (optional description here) (as of Feb. 11, 2012, 20:37). |
| AMA | NPNL. Acronym Geek. February 11, 2012, 20:37. Available at: http://www.acronymgeek.com/NPNL. Accessed February 11, 2012, 20:37. |