| APA | DDPO. (2012, February 14). In Acronym Geek. Retrieved 20:24, February 14, 2012, from http://www.acronymgeek.com/DDPO |
| MLA | "DDPO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/DDPO>. |
| MHRA | 'DDPO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/DDPO> [accessed 14 February 2012] |
| Chicago | "DDPO", http://www.acronymgeek.com/DDPO (accessed February 14, 2012). |
| CBE/CSE | DDPO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/DDPO. |
| Bluebook | DDPO, http://www.acronymgeek.com/DDPO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDPO, http://www.acronymgeek.com/DDPO (optional description here) (as of Feb. 14, 2012, 20:24). |
| AMA | DDPO. Acronym Geek. February 14, 2012, 20:24. Available at: http://www.acronymgeek.com/DDPO. Accessed February 14, 2012, 20:24. |