| APA | NPOK. (2012, February 15). In Acronym Geek. Retrieved 16:24, February 15, 2012, from http://www.acronymgeek.com/NPOK |
| MLA | "NPOK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/NPOK>. |
| MHRA | 'NPOK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/NPOK> [accessed 15 February 2012] |
| Chicago | "NPOK", http://www.acronymgeek.com/NPOK (accessed February 15, 2012). |
| CBE/CSE | NPOK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/NPOK. |
| Bluebook | NPOK, http://www.acronymgeek.com/NPOK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPOK, http://www.acronymgeek.com/NPOK (optional description here) (as of Feb. 15, 2012, 16:24). |
| AMA | NPOK. Acronym Geek. February 15, 2012, 16:24. Available at: http://www.acronymgeek.com/NPOK. Accessed February 15, 2012, 16:24. |