| APA | NPDK. (2012, February 16). In Acronym Geek. Retrieved 14:28, February 16, 2012, from http://www.acronymgeek.com/NPDK |
| MLA | "NPDK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/NPDK>. |
| MHRA | 'NPDK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/NPDK> [accessed 16 February 2012] |
| Chicago | "NPDK", http://www.acronymgeek.com/NPDK (accessed February 16, 2012). |
| CBE/CSE | NPDK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/NPDK. |
| Bluebook | NPDK, http://www.acronymgeek.com/NPDK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPDK, http://www.acronymgeek.com/NPDK (optional description here) (as of Feb. 16, 2012, 14:28). |
| AMA | NPDK. Acronym Geek. February 16, 2012, 14:28. Available at: http://www.acronymgeek.com/NPDK. Accessed February 16, 2012, 14:28. |