| APA | FDEF. (2012, February 16). In Acronym Geek. Retrieved 05:06, February 16, 2012, from http://www.acronymgeek.com/FDEF |
| MLA | "FDEF." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/FDEF>. |
| MHRA | 'FDEF', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/FDEF> [accessed 16 February 2012] |
| Chicago | "FDEF", http://www.acronymgeek.com/FDEF (accessed February 16, 2012). |
| CBE/CSE | FDEF [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/FDEF. |
| Bluebook | FDEF, http://www.acronymgeek.com/FDEF (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FDEF, http://www.acronymgeek.com/FDEF (optional description here) (as of Feb. 16, 2012, 05:06). |
| AMA | FDEF. Acronym Geek. February 16, 2012, 05:06. Available at: http://www.acronymgeek.com/FDEF. Accessed February 16, 2012, 05:06. |