| APA | DDX. (2012, February 11). In Acronym Geek. Retrieved 17:25, February 11, 2012, from http://www.acronymgeek.com/DDX |
| MLA | "DDX." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/DDX>. |
| MHRA | 'DDX', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/DDX> [accessed 11 February 2012] |
| Chicago | "DDX", http://www.acronymgeek.com/DDX (accessed February 11, 2012). |
| CBE/CSE | DDX [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/DDX. |
| Bluebook | DDX, http://www.acronymgeek.com/DDX (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDX, http://www.acronymgeek.com/DDX (optional description here) (as of Feb. 11, 2012, 17:25). |
| AMA | DDX. Acronym Geek. February 11, 2012, 17:25. Available at: http://www.acronymgeek.com/DDX. Accessed February 11, 2012, 17:25. |