| APA | DB9. (2012, February 11). In Acronym Geek. Retrieved 22:34, February 11, 2012, from http://www.acronymgeek.com/DB9 |
| MLA | "DB9." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/DB9>. |
| MHRA | 'DB9', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/DB9> [accessed 11 February 2012] |
| Chicago | "DB9", http://www.acronymgeek.com/DB9 (accessed February 11, 2012). |
| CBE/CSE | DB9 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/DB9. |
| Bluebook | DB9, http://www.acronymgeek.com/DB9 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DB9, http://www.acronymgeek.com/DB9 (optional description here) (as of Feb. 11, 2012, 22:34). |
| AMA | DB9. Acronym Geek. February 11, 2012, 22:34. Available at: http://www.acronymgeek.com/DB9. Accessed February 11, 2012, 22:34. |