| APA | PUDF. (2012, February 16). In Acronym Geek. Retrieved 21:54, February 16, 2012, from http://www.acronymgeek.com/PUDF |
| MLA | "PUDF." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PUDF>. |
| MHRA | 'PUDF', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PUDF> [accessed 16 February 2012] |
| Chicago | "PUDF", http://www.acronymgeek.com/PUDF (accessed February 16, 2012). |
| CBE/CSE | PUDF [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PUDF. |
| Bluebook | PUDF, http://www.acronymgeek.com/PUDF (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PUDF, http://www.acronymgeek.com/PUDF (optional description here) (as of Feb. 16, 2012, 21:54). |
| AMA | PUDF. Acronym Geek. February 16, 2012, 21:54. Available at: http://www.acronymgeek.com/PUDF. Accessed February 16, 2012, 21:54. |