| APA | DDUL. (2012, February 15). In Acronym Geek. Retrieved 16:38, February 15, 2012, from http://www.acronymgeek.com/DDUL |
| MLA | "DDUL." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/DDUL>. |
| MHRA | 'DDUL', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/DDUL> [accessed 15 February 2012] |
| Chicago | "DDUL", http://www.acronymgeek.com/DDUL (accessed February 15, 2012). |
| CBE/CSE | DDUL [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/DDUL. |
| Bluebook | DDUL, http://www.acronymgeek.com/DDUL (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDUL, http://www.acronymgeek.com/DDUL (optional description here) (as of Feb. 15, 2012, 16:38). |
| AMA | DDUL. Acronym Geek. February 15, 2012, 16:38. Available at: http://www.acronymgeek.com/DDUL. Accessed February 15, 2012, 16:38. |