| APA | GTGI. (2012, February 15). In Acronym Geek. Retrieved 04:07, February 15, 2012, from http://www.acronymgeek.com/GTGI |
| MLA | "GTGI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GTGI>. |
| MHRA | 'GTGI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GTGI> [accessed 15 February 2012] |
| Chicago | "GTGI", http://www.acronymgeek.com/GTGI (accessed February 15, 2012). |
| CBE/CSE | GTGI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GTGI. |
| Bluebook | GTGI, http://www.acronymgeek.com/GTGI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GTGI, http://www.acronymgeek.com/GTGI (optional description here) (as of Feb. 15, 2012, 04:07). |
| AMA | GTGI. Acronym Geek. February 15, 2012, 04:07. Available at: http://www.acronymgeek.com/GTGI. Accessed February 15, 2012, 04:07. |