| APA | NPPE. (2012, February 16). In Acronym Geek. Retrieved 21:25, February 16, 2012, from http://www.acronymgeek.com/NPPE |
| MLA | "NPPE." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/NPPE>. |
| MHRA | 'NPPE', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/NPPE> [accessed 16 February 2012] |
| Chicago | "NPPE", http://www.acronymgeek.com/NPPE (accessed February 16, 2012). |
| CBE/CSE | NPPE [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/NPPE. |
| Bluebook | NPPE, http://www.acronymgeek.com/NPPE (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPPE, http://www.acronymgeek.com/NPPE (optional description here) (as of Feb. 16, 2012, 21:25). |
| AMA | NPPE. Acronym Geek. February 16, 2012, 21:25. Available at: http://www.acronymgeek.com/NPPE. Accessed February 16, 2012, 21:25. |