| APA | HGRI. (2012, February 16). In Acronym Geek. Retrieved 21:23, February 16, 2012, from http://www.acronymgeek.com/HGRI |
| MLA | "HGRI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HGRI>. |
| MHRA | 'HGRI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HGRI> [accessed 16 February 2012] |
| Chicago | "HGRI", http://www.acronymgeek.com/HGRI (accessed February 16, 2012). |
| CBE/CSE | HGRI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HGRI. |
| Bluebook | HGRI, http://www.acronymgeek.com/HGRI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HGRI, http://www.acronymgeek.com/HGRI (optional description here) (as of Feb. 16, 2012, 21:23). |
| AMA | HGRI. Acronym Geek. February 16, 2012, 21:23. Available at: http://www.acronymgeek.com/HGRI. Accessed February 16, 2012, 21:23. |