| APA | QDI. (2012, February 14). In Acronym Geek. Retrieved 10:10, February 14, 2012, from http://www.acronymgeek.com/QDI |
| MLA | "QDI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/QDI>. |
| MHRA | 'QDI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/QDI> [accessed 14 February 2012] |
| Chicago | "QDI", http://www.acronymgeek.com/QDI (accessed February 14, 2012). |
| CBE/CSE | QDI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/QDI. |
| Bluebook | QDI, http://www.acronymgeek.com/QDI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, QDI, http://www.acronymgeek.com/QDI (optional description here) (as of Feb. 14, 2012, 10:10). |
| AMA | QDI. Acronym Geek. February 14, 2012, 10:10. Available at: http://www.acronymgeek.com/QDI. Accessed February 14, 2012, 10:10. |