| APA | DD. (2012, February 10). In Acronym Geek. Retrieved 10:39, February 10, 2012, from http://www.acronymgeek.com/DD |
| MLA | "DD." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/DD>. |
| MHRA | 'DD', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/DD> [accessed 10 February 2012] |
| Chicago | "DD", http://www.acronymgeek.com/DD (accessed February 10, 2012). |
| CBE/CSE | DD [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/DD. |
| Bluebook | DD, http://www.acronymgeek.com/DD (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DD, http://www.acronymgeek.com/DD (optional description here) (as of Feb. 10, 2012, 10:39). |
| AMA | DD. Acronym Geek. February 10, 2012, 10:39. Available at: http://www.acronymgeek.com/DD. Accessed February 10, 2012, 10:39. |