| APA | PUD. (2012, February 10). In Acronym Geek. Retrieved 10:16, February 10, 2012, from http://www.acronymgeek.com/PUD |
| MLA | "PUD." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/PUD>. |
| MHRA | 'PUD', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/PUD> [accessed 10 February 2012] |
| Chicago | "PUD", http://www.acronymgeek.com/PUD (accessed February 10, 2012). |
| CBE/CSE | PUD [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/PUD. |
| Bluebook | PUD, http://www.acronymgeek.com/PUD (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PUD, http://www.acronymgeek.com/PUD (optional description here) (as of Feb. 10, 2012, 10:16). |
| AMA | PUD. Acronym Geek. February 10, 2012, 10:16. Available at: http://www.acronymgeek.com/PUD. Accessed February 10, 2012, 10:16. |