| APA | HRDU. (2012, February 16). In Acronym Geek. Retrieved 04:14, February 16, 2012, from http://www.acronymgeek.com/HRDU |
| MLA | "HRDU." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HRDU>. |
| MHRA | 'HRDU', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HRDU> [accessed 16 February 2012] |
| Chicago | "HRDU", http://www.acronymgeek.com/HRDU (accessed February 16, 2012). |
| CBE/CSE | HRDU [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HRDU. |
| Bluebook | HRDU, http://www.acronymgeek.com/HRDU (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HRDU, http://www.acronymgeek.com/HRDU (optional description here) (as of Feb. 16, 2012, 04:14). |
| AMA | HRDU. Acronym Geek. February 16, 2012, 04:14. Available at: http://www.acronymgeek.com/HRDU. Accessed February 16, 2012, 04:14. |