| APA | GCI. (2012, February 13). In Acronym Geek. Retrieved 23:55, February 13, 2012, from http://www.acronymgeek.com/GCI |
| MLA | "GCI." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/GCI>. |
| MHRA | 'GCI', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/GCI> [accessed 13 February 2012] |
| Chicago | "GCI", http://www.acronymgeek.com/GCI (accessed February 13, 2012). |
| CBE/CSE | GCI [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/GCI. |
| Bluebook | GCI, http://www.acronymgeek.com/GCI (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GCI, http://www.acronymgeek.com/GCI (optional description here) (as of Feb. 13, 2012, 23:55). |
| AMA | GCI. Acronym Geek. February 13, 2012, 23:55. Available at: http://www.acronymgeek.com/GCI. Accessed February 13, 2012, 23:55. |