| APA | D.O.. (2012, February 14). In Acronym Geek. Retrieved 20:04, February 14, 2012, from http://www.acronymgeek.com/D.O. |
| MLA | "D.O.." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/D.O.>. |
| MHRA | 'D.O.', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/D.O.> [accessed 14 February 2012] |
| Chicago | "D.O.", http://www.acronymgeek.com/D.O. (accessed February 14, 2012). |
| CBE/CSE | D.O. [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/D.O.. |
| Bluebook | D.O., http://www.acronymgeek.com/D.O. (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, D.O., http://www.acronymgeek.com/D.O. (optional description here) (as of Feb. 14, 2012, 20:04). |
| AMA | D.O.. Acronym Geek. February 14, 2012, 20:04. Available at: http://www.acronymgeek.com/D.O.. Accessed February 14, 2012, 20:04. |