| APA | DO. (2012, February 9). In Acronym Geek. Retrieved 13:27, February 9, 2012, from http://www.acronymgeek.com/DO |
| MLA | "DO." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/DO>. |
| MHRA | 'DO', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/DO> [accessed 9 February 2012] |
| Chicago | "DO", http://www.acronymgeek.com/DO (accessed February 9, 2012). |
| CBE/CSE | DO [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/DO. |
| Bluebook | DO, http://www.acronymgeek.com/DO (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DO, http://www.acronymgeek.com/DO (optional description here) (as of Feb. 9, 2012, 13:27). |
| AMA | DO. Acronym Geek. February 9, 2012, 13:27. Available at: http://www.acronymgeek.com/DO. Accessed February 9, 2012, 13:27. |