| APA | DEFK. (2012, February 16). In Acronym Geek. Retrieved 18:29, February 16, 2012, from http://www.acronymgeek.com/DEFK |
| MLA | "DEFK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/DEFK>. |
| MHRA | 'DEFK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/DEFK> [accessed 16 February 2012] |
| Chicago | "DEFK", http://www.acronymgeek.com/DEFK (accessed February 16, 2012). |
| CBE/CSE | DEFK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/DEFK. |
| Bluebook | DEFK, http://www.acronymgeek.com/DEFK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DEFK, http://www.acronymgeek.com/DEFK (optional description here) (as of Feb. 16, 2012, 18:29). |
| AMA | DEFK. Acronym Geek. February 16, 2012, 18:29. Available at: http://www.acronymgeek.com/DEFK. Accessed February 16, 2012, 18:29. |