| APA | NPEH. (2012, February 15). In Acronym Geek. Retrieved 02:43, February 15, 2012, from http://www.acronymgeek.com/NPEH |
| MLA | "NPEH." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/NPEH>. |
| MHRA | 'NPEH', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/NPEH> [accessed 15 February 2012] |
| Chicago | "NPEH", http://www.acronymgeek.com/NPEH (accessed February 15, 2012). |
| CBE/CSE | NPEH [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/NPEH. |
| Bluebook | NPEH, http://www.acronymgeek.com/NPEH (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPEH, http://www.acronymgeek.com/NPEH (optional description here) (as of Feb. 15, 2012, 02:43). |
| AMA | NPEH. Acronym Geek. February 15, 2012, 02:43. Available at: http://www.acronymgeek.com/NPEH. Accessed February 15, 2012, 02:43. |