| APA | NPDN. (2012, February 15). In Acronym Geek. Retrieved 04:14, February 15, 2012, from http://www.acronymgeek.com/NPDN |
| MLA | "NPDN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/NPDN>. |
| MHRA | 'NPDN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/NPDN> [accessed 15 February 2012] |
| Chicago | "NPDN", http://www.acronymgeek.com/NPDN (accessed February 15, 2012). |
| CBE/CSE | NPDN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/NPDN. |
| Bluebook | NPDN, http://www.acronymgeek.com/NPDN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPDN, http://www.acronymgeek.com/NPDN (optional description here) (as of Feb. 15, 2012, 04:14). |
| AMA | NPDN. Acronym Geek. February 15, 2012, 04:14. Available at: http://www.acronymgeek.com/NPDN. Accessed February 15, 2012, 04:14. |