| APA | NPER. (2012, February 17). In Acronym Geek. Retrieved 05:05, February 17, 2012, from http://www.acronymgeek.com/NPER |
| MLA | "NPER." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/NPER>. |
| MHRA | 'NPER', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/NPER> [accessed 17 February 2012] |
| Chicago | "NPER", http://www.acronymgeek.com/NPER (accessed February 17, 2012). |
| CBE/CSE | NPER [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/NPER. |
| Bluebook | NPER, http://www.acronymgeek.com/NPER (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPER, http://www.acronymgeek.com/NPER (optional description here) (as of Feb. 17, 2012, 05:05). |
| AMA | NPER. Acronym Geek. February 17, 2012, 05:05. Available at: http://www.acronymgeek.com/NPER. Accessed February 17, 2012, 05:05. |