| APA | PDDR. (2012, February 15). In Acronym Geek. Retrieved 06:15, February 15, 2012, from http://www.acronymgeek.com/PDDR |
| MLA | "PDDR." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PDDR>. |
| MHRA | 'PDDR', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PDDR> [accessed 15 February 2012] |
| Chicago | "PDDR", http://www.acronymgeek.com/PDDR (accessed February 15, 2012). |
| CBE/CSE | PDDR [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PDDR. |
| Bluebook | PDDR, http://www.acronymgeek.com/PDDR (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDDR, http://www.acronymgeek.com/PDDR (optional description here) (as of Feb. 15, 2012, 06:15). |
| AMA | PDDR. Acronym Geek. February 15, 2012, 06:15. Available at: http://www.acronymgeek.com/PDDR. Accessed February 15, 2012, 06:15. |