| APA | QDH. (2012, February 13). In Acronym Geek. Retrieved 21:05, February 13, 2012, from http://www.acronymgeek.com/QDH |
| MLA | "QDH." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/QDH>. |
| MHRA | 'QDH', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/QDH> [accessed 13 February 2012] |
| Chicago | "QDH", http://www.acronymgeek.com/QDH (accessed February 13, 2012). |
| CBE/CSE | QDH [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/QDH. |
| Bluebook | QDH, http://www.acronymgeek.com/QDH (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, QDH, http://www.acronymgeek.com/QDH (optional description here) (as of Feb. 13, 2012, 21:05). |
| AMA | QDH. Acronym Geek. February 13, 2012, 21:05. Available at: http://www.acronymgeek.com/QDH. Accessed February 13, 2012, 21:05. |