| APA | GDO. (2012, February 15). In Acronym Geek. Retrieved 03:17, February 15, 2012, from http://www.acronymgeek.com/GDO |
| MLA | "GDO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GDO>. |
| MHRA | 'GDO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GDO> [accessed 15 February 2012] |
| Chicago | "GDO", http://www.acronymgeek.com/GDO (accessed February 15, 2012). |
| CBE/CSE | GDO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GDO. |
| Bluebook | GDO, http://www.acronymgeek.com/GDO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GDO, http://www.acronymgeek.com/GDO (optional description here) (as of Feb. 15, 2012, 03:17). |
| AMA | GDO. Acronym Geek. February 15, 2012, 03:17. Available at: http://www.acronymgeek.com/GDO. Accessed February 15, 2012, 03:17. |