| APA | HHG. (2012, February 10). In Acronym Geek. Retrieved 17:10, February 10, 2012, from http://www.acronymgeek.com/HHG |
| MLA | "HHG." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/HHG>. |
| MHRA | 'HHG', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/HHG> [accessed 10 February 2012] |
| Chicago | "HHG", http://www.acronymgeek.com/HHG (accessed February 10, 2012). |
| CBE/CSE | HHG [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/HHG. |
| Bluebook | HHG, http://www.acronymgeek.com/HHG (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHG, http://www.acronymgeek.com/HHG (optional description here) (as of Feb. 10, 2012, 17:10). |
| AMA | HHG. Acronym Geek. February 10, 2012, 17:10. Available at: http://www.acronymgeek.com/HHG. Accessed February 10, 2012, 17:10. |