| APA | PNDU. (2012, February 16). In Acronym Geek. Retrieved 00:44, February 16, 2012, from http://www.acronymgeek.com/PNDU |
| MLA | "PNDU." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PNDU>. |
| MHRA | 'PNDU', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PNDU> [accessed 16 February 2012] |
| Chicago | "PNDU", http://www.acronymgeek.com/PNDU (accessed February 16, 2012). |
| CBE/CSE | PNDU [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PNDU. |
| Bluebook | PNDU, http://www.acronymgeek.com/PNDU (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNDU, http://www.acronymgeek.com/PNDU (optional description here) (as of Feb. 16, 2012, 00:44). |
| AMA | PNDU. Acronym Geek. February 16, 2012, 00:44. Available at: http://www.acronymgeek.com/PNDU. Accessed February 16, 2012, 00:44. |