| APA | HDRG. (2012, February 16). In Acronym Geek. Retrieved 22:05, February 16, 2012, from http://www.acronymgeek.com/HDRG |
| MLA | "HDRG." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HDRG>. |
| MHRA | 'HDRG', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HDRG> [accessed 16 February 2012] |
| Chicago | "HDRG", http://www.acronymgeek.com/HDRG (accessed February 16, 2012). |
| CBE/CSE | HDRG [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HDRG. |
| Bluebook | HDRG, http://www.acronymgeek.com/HDRG (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDRG, http://www.acronymgeek.com/HDRG (optional description here) (as of Feb. 16, 2012, 22:05). |
| AMA | HDRG. Acronym Geek. February 16, 2012, 22:05. Available at: http://www.acronymgeek.com/HDRG. Accessed February 16, 2012, 22:05. |