| APA | PDDF. (2012, February 16). In Acronym Geek. Retrieved 11:20, February 16, 2012, from http://www.acronymgeek.com/PDDF |
| MLA | "PDDF." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PDDF>. |
| MHRA | 'PDDF', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PDDF> [accessed 16 February 2012] |
| Chicago | "PDDF", http://www.acronymgeek.com/PDDF (accessed February 16, 2012). |
| CBE/CSE | PDDF [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PDDF. |
| Bluebook | PDDF, http://www.acronymgeek.com/PDDF (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDDF, http://www.acronymgeek.com/PDDF (optional description here) (as of Feb. 16, 2012, 11:20). |
| AMA | PDDF. Acronym Geek. February 16, 2012, 11:20. Available at: http://www.acronymgeek.com/PDDF. Accessed February 16, 2012, 11:20. |