| APA | DDF. (2012, February 4). In Acronym Geek. Retrieved 12:03, February 4, 2012, from http://www.acronymgeek.com/DDF |
| MLA | "DDF." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/DDF>. |
| MHRA | 'DDF', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/DDF> [accessed 4 February 2012] |
| Chicago | "DDF", http://www.acronymgeek.com/DDF (accessed February 4, 2012). |
| CBE/CSE | DDF [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/DDF. |
| Bluebook | DDF, http://www.acronymgeek.com/DDF (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDF, http://www.acronymgeek.com/DDF (optional description here) (as of Feb. 4, 2012, 12:03). |
| AMA | DDF. Acronym Geek. February 4, 2012, 12:03. Available at: http://www.acronymgeek.com/DDF. Accessed February 4, 2012, 12:03. |