| APA | GGKO. (2012, February 15). In Acronym Geek. Retrieved 00:45, February 15, 2012, from http://www.acronymgeek.com/GGKO |
| MLA | "GGKO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GGKO>. |
| MHRA | 'GGKO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GGKO> [accessed 15 February 2012] |
| Chicago | "GGKO", http://www.acronymgeek.com/GGKO (accessed February 15, 2012). |
| CBE/CSE | GGKO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GGKO. |
| Bluebook | GGKO, http://www.acronymgeek.com/GGKO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GGKO, http://www.acronymgeek.com/GGKO (optional description here) (as of Feb. 15, 2012, 00:45). |
| AMA | GGKO. Acronym Geek. February 15, 2012, 00:45. Available at: http://www.acronymgeek.com/GGKO. Accessed February 15, 2012, 00:45. |