| APA | DDL. (2012, February 13). In Acronym Geek. Retrieved 23:22, February 13, 2012, from http://www.acronymgeek.com/DDL |
| MLA | "DDL." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/DDL>. |
| MHRA | 'DDL', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/DDL> [accessed 13 February 2012] |
| Chicago | "DDL", http://www.acronymgeek.com/DDL (accessed February 13, 2012). |
| CBE/CSE | DDL [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/DDL. |
| Bluebook | DDL, http://www.acronymgeek.com/DDL (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDL, http://www.acronymgeek.com/DDL (optional description here) (as of Feb. 13, 2012, 23:22). |
| AMA | DDL. Acronym Geek. February 13, 2012, 23:22. Available at: http://www.acronymgeek.com/DDL. Accessed February 13, 2012, 23:22. |