| APA | NFK. (2012, February 14). In Acronym Geek. Retrieved 10:26, February 14, 2012, from http://www.acronymgeek.com/NFK |
| MLA | "NFK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/NFK>. |
| MHRA | 'NFK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/NFK> [accessed 14 February 2012] |
| Chicago | "NFK", http://www.acronymgeek.com/NFK (accessed February 14, 2012). |
| CBE/CSE | NFK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/NFK. |
| Bluebook | NFK, http://www.acronymgeek.com/NFK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NFK, http://www.acronymgeek.com/NFK (optional description here) (as of Feb. 14, 2012, 10:26). |
| AMA | NFK. Acronym Geek. February 14, 2012, 10:26. Available at: http://www.acronymgeek.com/NFK. Accessed February 14, 2012, 10:26. |