| APA | DDPI. (2012, February 16). In Acronym Geek. Retrieved 06:11, February 16, 2012, from http://www.acronymgeek.com/DDPI |
| MLA | "DDPI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/DDPI>. |
| MHRA | 'DDPI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/DDPI> [accessed 16 February 2012] |
| Chicago | "DDPI", http://www.acronymgeek.com/DDPI (accessed February 16, 2012). |
| CBE/CSE | DDPI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/DDPI. |
| Bluebook | DDPI, http://www.acronymgeek.com/DDPI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDPI, http://www.acronymgeek.com/DDPI (optional description here) (as of Feb. 16, 2012, 06:11). |
| AMA | DDPI. Acronym Geek. February 16, 2012, 06:11. Available at: http://www.acronymgeek.com/DDPI. Accessed February 16, 2012, 06:11. |