| APA | D.U.. (2012, February 15). In Acronym Geek. Retrieved 10:56, February 15, 2012, from http://www.acronymgeek.com/D.U. |
| MLA | "D.U.." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/D.U.>. |
| MHRA | 'D.U.', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/D.U.> [accessed 15 February 2012] |
| Chicago | "D.U.", http://www.acronymgeek.com/D.U. (accessed February 15, 2012). |
| CBE/CSE | D.U. [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/D.U.. |
| Bluebook | D.U., http://www.acronymgeek.com/D.U. (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, D.U., http://www.acronymgeek.com/D.U. (optional description here) (as of Feb. 15, 2012, 10:56). |
| AMA | D.U.. Acronym Geek. February 15, 2012, 10:56. Available at: http://www.acronymgeek.com/D.U.. Accessed February 15, 2012, 10:56. |