| APA | PDDI. (2012, February 17). In Acronym Geek. Retrieved 07:04, February 17, 2012, from http://www.acronymgeek.com/PDDI |
| MLA | "PDDI." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PDDI>. |
| MHRA | 'PDDI', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PDDI> [accessed 17 February 2012] |
| Chicago | "PDDI", http://www.acronymgeek.com/PDDI (accessed February 17, 2012). |
| CBE/CSE | PDDI [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PDDI. |
| Bluebook | PDDI, http://www.acronymgeek.com/PDDI (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDDI, http://www.acronymgeek.com/PDDI (optional description here) (as of Feb. 17, 2012, 07:04). |
| AMA | PDDI. Acronym Geek. February 17, 2012, 07:04. Available at: http://www.acronymgeek.com/PDDI. Accessed February 17, 2012, 07:04. |