| APA | DDUP. (2012, February 17). In Acronym Geek. Retrieved 02:37, February 17, 2012, from http://www.acronymgeek.com/DDUP |
| MLA | "DDUP." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/DDUP>. |
| MHRA | 'DDUP', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/DDUP> [accessed 17 February 2012] |
| Chicago | "DDUP", http://www.acronymgeek.com/DDUP (accessed February 17, 2012). |
| CBE/CSE | DDUP [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/DDUP. |
| Bluebook | DDUP, http://www.acronymgeek.com/DDUP (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDUP, http://www.acronymgeek.com/DDUP (optional description here) (as of Feb. 17, 2012, 02:37). |
| AMA | DDUP. Acronym Geek. February 17, 2012, 02:37. Available at: http://www.acronymgeek.com/DDUP. Accessed February 17, 2012, 02:37. |