| APA | PDDK. (2012, February 15). In Acronym Geek. Retrieved 00:02, February 15, 2012, from http://www.acronymgeek.com/PDDK |
| MLA | "PDDK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PDDK>. |
| MHRA | 'PDDK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PDDK> [accessed 15 February 2012] |
| Chicago | "PDDK", http://www.acronymgeek.com/PDDK (accessed February 15, 2012). |
| CBE/CSE | PDDK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PDDK. |
| Bluebook | PDDK, http://www.acronymgeek.com/PDDK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDDK, http://www.acronymgeek.com/PDDK (optional description here) (as of Feb. 15, 2012, 00:02). |
| AMA | PDDK. Acronym Geek. February 15, 2012, 00:02. Available at: http://www.acronymgeek.com/PDDK. Accessed February 15, 2012, 00:02. |