| APA | PDR. (2012, February 4). In Acronym Geek. Retrieved 11:49, February 4, 2012, from http://www.acronymgeek.com/PDR |
| MLA | "PDR." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/PDR>. |
| MHRA | 'PDR', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/PDR> [accessed 4 February 2012] |
| Chicago | "PDR", http://www.acronymgeek.com/PDR (accessed February 4, 2012). |
| CBE/CSE | PDR [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/PDR. |
| Bluebook | PDR, http://www.acronymgeek.com/PDR (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDR, http://www.acronymgeek.com/PDR (optional description here) (as of Feb. 4, 2012, 11:49). |
| AMA | PDR. Acronym Geek. February 4, 2012, 11:49. Available at: http://www.acronymgeek.com/PDR. Accessed February 4, 2012, 11:49. |