| APA | DDN. (2012, February 9). In Acronym Geek. Retrieved 21:03, February 9, 2012, from http://www.acronymgeek.com/DDN |
| MLA | "DDN." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/DDN>. |
| MHRA | 'DDN', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/DDN> [accessed 9 February 2012] |
| Chicago | "DDN", http://www.acronymgeek.com/DDN (accessed February 9, 2012). |
| CBE/CSE | DDN [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/DDN. |
| Bluebook | DDN, http://www.acronymgeek.com/DDN (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDN, http://www.acronymgeek.com/DDN (optional description here) (as of Feb. 9, 2012, 21:03). |
| AMA | DDN. Acronym Geek. February 9, 2012, 21:03. Available at: http://www.acronymgeek.com/DDN. Accessed February 9, 2012, 21:03. |