| APA | HHGD. (2012, February 15). In Acronym Geek. Retrieved 00:39, February 15, 2012, from http://www.acronymgeek.com/HHGD |
| MLA | "HHGD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHGD>. |
| MHRA | 'HHGD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHGD> [accessed 15 February 2012] |
| Chicago | "HHGD", http://www.acronymgeek.com/HHGD (accessed February 15, 2012). |
| CBE/CSE | HHGD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHGD. |
| Bluebook | HHGD, http://www.acronymgeek.com/HHGD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHGD, http://www.acronymgeek.com/HHGD (optional description here) (as of Feb. 15, 2012, 00:39). |
| AMA | HHGD. Acronym Geek. February 15, 2012, 00:39. Available at: http://www.acronymgeek.com/HHGD. Accessed February 15, 2012, 00:39. |