| APA | DDU. (2012, February 14). In Acronym Geek. Retrieved 07:08, February 14, 2012, from http://www.acronymgeek.com/DDU |
| MLA | "DDU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/DDU>. |
| MHRA | 'DDU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/DDU> [accessed 14 February 2012] |
| Chicago | "DDU", http://www.acronymgeek.com/DDU (accessed February 14, 2012). |
| CBE/CSE | DDU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/DDU. |
| Bluebook | DDU, http://www.acronymgeek.com/DDU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDU, http://www.acronymgeek.com/DDU (optional description here) (as of Feb. 14, 2012, 07:08). |
| AMA | DDU. Acronym Geek. February 14, 2012, 07:08. Available at: http://www.acronymgeek.com/DDU. Accessed February 14, 2012, 07:08. |