| APA | NPEU. (2012, February 16). In Acronym Geek. Retrieved 11:28, February 16, 2012, from http://www.acronymgeek.com/NPEU |
| MLA | "NPEU." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/NPEU>. |
| MHRA | 'NPEU', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/NPEU> [accessed 16 February 2012] |
| Chicago | "NPEU", http://www.acronymgeek.com/NPEU (accessed February 16, 2012). |
| CBE/CSE | NPEU [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/NPEU. |
| Bluebook | NPEU, http://www.acronymgeek.com/NPEU (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPEU, http://www.acronymgeek.com/NPEU (optional description here) (as of Feb. 16, 2012, 11:28). |
| AMA | NPEU. Acronym Geek. February 16, 2012, 11:28. Available at: http://www.acronymgeek.com/NPEU. Accessed February 16, 2012, 11:28. |