| APA | D.D.. (2012, February 16). In Acronym Geek. Retrieved 02:05, February 16, 2012, from http://www.acronymgeek.com/D.D. |
| MLA | "D.D.." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/D.D.>. |
| MHRA | 'D.D.', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/D.D.> [accessed 16 February 2012] |
| Chicago | "D.D.", http://www.acronymgeek.com/D.D. (accessed February 16, 2012). |
| CBE/CSE | D.D. [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/D.D.. |
| Bluebook | D.D., http://www.acronymgeek.com/D.D. (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, D.D., http://www.acronymgeek.com/D.D. (optional description here) (as of Feb. 16, 2012, 02:05). |
| AMA | D.D.. Acronym Geek. February 16, 2012, 02:05. Available at: http://www.acronymgeek.com/D.D.. Accessed February 16, 2012, 02:05. |