| APA | GTGS. (2012, February 16). In Acronym Geek. Retrieved 17:58, February 16, 2012, from http://www.acronymgeek.com/GTGS |
| MLA | "GTGS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GTGS>. |
| MHRA | 'GTGS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GTGS> [accessed 16 February 2012] |
| Chicago | "GTGS", http://www.acronymgeek.com/GTGS (accessed February 16, 2012). |
| CBE/CSE | GTGS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GTGS. |
| Bluebook | GTGS, http://www.acronymgeek.com/GTGS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GTGS, http://www.acronymgeek.com/GTGS (optional description here) (as of Feb. 16, 2012, 17:58). |
| AMA | GTGS. Acronym Geek. February 16, 2012, 17:58. Available at: http://www.acronymgeek.com/GTGS. Accessed February 16, 2012, 17:58. |