| APA | GHGS. (2012, February 15). In Acronym Geek. Retrieved 22:54, February 15, 2012, from http://www.acronymgeek.com/GHGS |
| MLA | "GHGS." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GHGS>. |
| MHRA | 'GHGS', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GHGS> [accessed 15 February 2012] |
| Chicago | "GHGS", http://www.acronymgeek.com/GHGS (accessed February 15, 2012). |
| CBE/CSE | GHGS [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GHGS. |
| Bluebook | GHGS, http://www.acronymgeek.com/GHGS (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GHGS, http://www.acronymgeek.com/GHGS (optional description here) (as of Feb. 15, 2012, 22:54). |
| AMA | GHGS. Acronym Geek. February 15, 2012, 22:54. Available at: http://www.acronymgeek.com/GHGS. Accessed February 15, 2012, 22:54. |