| APA | DF.. (2012, February 12). In Acronym Geek. Retrieved 07:07, February 12, 2012, from http://www.acronymgeek.com/DF. |
| MLA | "DF.." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/DF.>. |
| MHRA | 'DF.', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/DF.> [accessed 12 February 2012] |
| Chicago | "DF.", http://www.acronymgeek.com/DF. (accessed February 12, 2012). |
| CBE/CSE | DF. [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/DF.. |
| Bluebook | DF., http://www.acronymgeek.com/DF. (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DF., http://www.acronymgeek.com/DF. (optional description here) (as of Feb. 12, 2012, 07:07). |
| AMA | DF.. Acronym Geek. February 12, 2012, 07:07. Available at: http://www.acronymgeek.com/DF.. Accessed February 12, 2012, 07:07. |