| APA | GZKO. (2012, February 16). In Acronym Geek. Retrieved 05:44, February 16, 2012, from http://www.acronymgeek.com/GZKO |
| MLA | "GZKO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GZKO>. |
| MHRA | 'GZKO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GZKO> [accessed 16 February 2012] |
| Chicago | "GZKO", http://www.acronymgeek.com/GZKO (accessed February 16, 2012). |
| CBE/CSE | GZKO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GZKO. |
| Bluebook | GZKO, http://www.acronymgeek.com/GZKO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GZKO, http://www.acronymgeek.com/GZKO (optional description here) (as of Feb. 16, 2012, 05:44). |
| AMA | GZKO. Acronym Geek. February 16, 2012, 05:44. Available at: http://www.acronymgeek.com/GZKO. Accessed February 16, 2012, 05:44. |