| APA | UDF. (2012, February 15). In Acronym Geek. Retrieved 03:21, February 15, 2012, from http://www.acronymgeek.com/UDF |
| MLA | "UDF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/UDF>. |
| MHRA | 'UDF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/UDF> [accessed 15 February 2012] |
| Chicago | "UDF", http://www.acronymgeek.com/UDF (accessed February 15, 2012). |
| CBE/CSE | UDF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/UDF. |
| Bluebook | UDF, http://www.acronymgeek.com/UDF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UDF, http://www.acronymgeek.com/UDF (optional description here) (as of Feb. 15, 2012, 03:21). |
| AMA | UDF. Acronym Geek. February 15, 2012, 03:21. Available at: http://www.acronymgeek.com/UDF. Accessed February 15, 2012, 03:21. |