| APA | PNDN. (2012, February 17). In Acronym Geek. Retrieved 03:33, February 17, 2012, from http://www.acronymgeek.com/PNDN |
| MLA | "PNDN." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PNDN>. |
| MHRA | 'PNDN', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PNDN> [accessed 17 February 2012] |
| Chicago | "PNDN", http://www.acronymgeek.com/PNDN (accessed February 17, 2012). |
| CBE/CSE | PNDN [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PNDN. |
| Bluebook | PNDN, http://www.acronymgeek.com/PNDN (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNDN, http://www.acronymgeek.com/PNDN (optional description here) (as of Feb. 17, 2012, 03:33). |
| AMA | PNDN. Acronym Geek. February 17, 2012, 03:33. Available at: http://www.acronymgeek.com/PNDN. Accessed February 17, 2012, 03:33. |