| APA | HHGI. (2012, February 16). In Acronym Geek. Retrieved 11:41, February 16, 2012, from http://www.acronymgeek.com/HHGI |
| MLA | "HHGI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HHGI>. |
| MHRA | 'HHGI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HHGI> [accessed 16 February 2012] |
| Chicago | "HHGI", http://www.acronymgeek.com/HHGI (accessed February 16, 2012). |
| CBE/CSE | HHGI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HHGI. |
| Bluebook | HHGI, http://www.acronymgeek.com/HHGI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHGI, http://www.acronymgeek.com/HHGI (optional description here) (as of Feb. 16, 2012, 11:41). |
| AMA | HHGI. Acronym Geek. February 16, 2012, 11:41. Available at: http://www.acronymgeek.com/HHGI. Accessed February 16, 2012, 11:41. |