| APA | HDRU. (2012, February 15). In Acronym Geek. Retrieved 10:32, February 15, 2012, from http://www.acronymgeek.com/HDRU |
| MLA | "HDRU." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HDRU>. |
| MHRA | 'HDRU', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HDRU> [accessed 15 February 2012] |
| Chicago | "HDRU", http://www.acronymgeek.com/HDRU (accessed February 15, 2012). |
| CBE/CSE | HDRU [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HDRU. |
| Bluebook | HDRU, http://www.acronymgeek.com/HDRU (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDRU, http://www.acronymgeek.com/HDRU (optional description here) (as of Feb. 15, 2012, 10:32). |
| AMA | HDRU. Acronym Geek. February 15, 2012, 10:32. Available at: http://www.acronymgeek.com/HDRU. Accessed February 15, 2012, 10:32. |