| APA | DDY. (2012, February 14). In Acronym Geek. Retrieved 10:16, February 14, 2012, from http://www.acronymgeek.com/DDY |
| MLA | "DDY." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/DDY>. |
| MHRA | 'DDY', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/DDY> [accessed 14 February 2012] |
| Chicago | "DDY", http://www.acronymgeek.com/DDY (accessed February 14, 2012). |
| CBE/CSE | DDY [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/DDY. |
| Bluebook | DDY, http://www.acronymgeek.com/DDY (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDY, http://www.acronymgeek.com/DDY (optional description here) (as of Feb. 14, 2012, 10:16). |
| AMA | DDY. Acronym Geek. February 14, 2012, 10:16. Available at: http://www.acronymgeek.com/DDY. Accessed February 14, 2012, 10:16. |