| APA | PKNF. (2012, February 15). In Acronym Geek. Retrieved 09:36, February 15, 2012, from http://www.acronymgeek.com/PKNF |
| MLA | "PKNF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PKNF>. |
| MHRA | 'PKNF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PKNF> [accessed 15 February 2012] |
| Chicago | "PKNF", http://www.acronymgeek.com/PKNF (accessed February 15, 2012). |
| CBE/CSE | PKNF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PKNF. |
| Bluebook | PKNF, http://www.acronymgeek.com/PKNF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PKNF, http://www.acronymgeek.com/PKNF (optional description here) (as of Feb. 15, 2012, 09:36). |
| AMA | PKNF. Acronym Geek. February 15, 2012, 09:36. Available at: http://www.acronymgeek.com/PKNF. Accessed February 15, 2012, 09:36. |