| APA | HGA. (2012, February 14). In Acronym Geek. Retrieved 03:55, February 14, 2012, from http://www.acronymgeek.com/HGA |
| MLA | "HGA." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HGA>. |
| MHRA | 'HGA', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HGA> [accessed 14 February 2012] |
| Chicago | "HGA", http://www.acronymgeek.com/HGA (accessed February 14, 2012). |
| CBE/CSE | HGA [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HGA. |
| Bluebook | HGA, http://www.acronymgeek.com/HGA (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HGA, http://www.acronymgeek.com/HGA (optional description here) (as of Feb. 14, 2012, 03:55). |
| AMA | HGA. Acronym Geek. February 14, 2012, 03:55. Available at: http://www.acronymgeek.com/HGA. Accessed February 14, 2012, 03:55. |