| APA | HGD. (2012, February 14). In Acronym Geek. Retrieved 20:33, February 14, 2012, from http://www.acronymgeek.com/HGD |
| MLA | "HGD." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HGD>. |
| MHRA | 'HGD', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HGD> [accessed 14 February 2012] |
| Chicago | "HGD", http://www.acronymgeek.com/HGD (accessed February 14, 2012). |
| CBE/CSE | HGD [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HGD. |
| Bluebook | HGD, http://www.acronymgeek.com/HGD (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HGD, http://www.acronymgeek.com/HGD (optional description here) (as of Feb. 14, 2012, 20:33). |
| AMA | HGD. Acronym Geek. February 14, 2012, 20:33. Available at: http://www.acronymgeek.com/HGD. Accessed February 14, 2012, 20:33. |