| APA | DO.. (2012, February 11). In Acronym Geek. Retrieved 17:10, February 11, 2012, from http://www.acronymgeek.com/DO. |
| MLA | "DO.." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/DO.>. |
| MHRA | 'DO.', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/DO.> [accessed 11 February 2012] |
| Chicago | "DO.", http://www.acronymgeek.com/DO. (accessed February 11, 2012). |
| CBE/CSE | DO. [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/DO.. |
| Bluebook | DO., http://www.acronymgeek.com/DO. (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DO., http://www.acronymgeek.com/DO. (optional description here) (as of Feb. 11, 2012, 17:10). |
| AMA | DO.. Acronym Geek. February 11, 2012, 17:10. Available at: http://www.acronymgeek.com/DO.. Accessed February 11, 2012, 17:10. |