| APA | DDEO. (2012, February 14). In Acronym Geek. Retrieved 12:54, February 14, 2012, from http://www.acronymgeek.com/DDEO |
| MLA | "DDEO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/DDEO>. |
| MHRA | 'DDEO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/DDEO> [accessed 14 February 2012] |
| Chicago | "DDEO", http://www.acronymgeek.com/DDEO (accessed February 14, 2012). |
| CBE/CSE | DDEO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/DDEO. |
| Bluebook | DDEO, http://www.acronymgeek.com/DDEO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDEO, http://www.acronymgeek.com/DDEO (optional description here) (as of Feb. 14, 2012, 12:54). |
| AMA | DDEO. Acronym Geek. February 14, 2012, 12:54. Available at: http://www.acronymgeek.com/DDEO. Accessed February 14, 2012, 12:54. |