| APA | NNPD. (2012, February 12). In Acronym Geek. Retrieved 12:53, February 12, 2012, from http://www.acronymgeek.com/NNPD |
| MLA | "NNPD." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/NNPD>. |
| MHRA | 'NNPD', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/NNPD> [accessed 12 February 2012] |
| Chicago | "NNPD", http://www.acronymgeek.com/NNPD (accessed February 12, 2012). |
| CBE/CSE | NNPD [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/NNPD. |
| Bluebook | NNPD, http://www.acronymgeek.com/NNPD (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NNPD, http://www.acronymgeek.com/NNPD (optional description here) (as of Feb. 12, 2012, 12:53). |
| AMA | NNPD. Acronym Geek. February 12, 2012, 12:53. Available at: http://www.acronymgeek.com/NNPD. Accessed February 12, 2012, 12:53. |