| APA | NPFK. (2012, February 15). In Acronym Geek. Retrieved 21:45, February 15, 2012, from http://www.acronymgeek.com/NPFK |
| MLA | "NPFK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/NPFK>. |
| MHRA | 'NPFK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/NPFK> [accessed 15 February 2012] |
| Chicago | "NPFK", http://www.acronymgeek.com/NPFK (accessed February 15, 2012). |
| CBE/CSE | NPFK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/NPFK. |
| Bluebook | NPFK, http://www.acronymgeek.com/NPFK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPFK, http://www.acronymgeek.com/NPFK (optional description here) (as of Feb. 15, 2012, 21:45). |
| AMA | NPFK. Acronym Geek. February 15, 2012, 21:45. Available at: http://www.acronymgeek.com/NPFK. Accessed February 15, 2012, 21:45. |