| APA | DUF. (2012, February 14). In Acronym Geek. Retrieved 06:33, February 14, 2012, from http://www.acronymgeek.com/DUF |
| MLA | "DUF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/DUF>. |
| MHRA | 'DUF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/DUF> [accessed 14 February 2012] |
| Chicago | "DUF", http://www.acronymgeek.com/DUF (accessed February 14, 2012). |
| CBE/CSE | DUF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/DUF. |
| Bluebook | DUF, http://www.acronymgeek.com/DUF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DUF, http://www.acronymgeek.com/DUF (optional description here) (as of Feb. 14, 2012, 06:33). |
| AMA | DUF. Acronym Geek. February 14, 2012, 06:33. Available at: http://www.acronymgeek.com/DUF. Accessed February 14, 2012, 06:33. |