| APA | DIFU. (2012, February 17). In Acronym Geek. Retrieved 08:09, February 17, 2012, from http://www.acronymgeek.com/DIFU |
| MLA | "DIFU." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/DIFU>. |
| MHRA | 'DIFU', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/DIFU> [accessed 17 February 2012] |
| Chicago | "DIFU", http://www.acronymgeek.com/DIFU (accessed February 17, 2012). |
| CBE/CSE | DIFU [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/DIFU. |
| Bluebook | DIFU, http://www.acronymgeek.com/DIFU (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DIFU, http://www.acronymgeek.com/DIFU (optional description here) (as of Feb. 17, 2012, 08:09). |
| AMA | DIFU. Acronym Geek. February 17, 2012, 08:09. Available at: http://www.acronymgeek.com/DIFU. Accessed February 17, 2012, 08:09. |