| APA | GZK. (2012, February 12). In Acronym Geek. Retrieved 07:03, February 12, 2012, from http://www.acronymgeek.com/GZK |
| MLA | "GZK." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/GZK>. |
| MHRA | 'GZK', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/GZK> [accessed 12 February 2012] |
| Chicago | "GZK", http://www.acronymgeek.com/GZK (accessed February 12, 2012). |
| CBE/CSE | GZK [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/GZK. |
| Bluebook | GZK, http://www.acronymgeek.com/GZK (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GZK, http://www.acronymgeek.com/GZK (optional description here) (as of Feb. 12, 2012, 07:03). |
| AMA | GZK. Acronym Geek. February 12, 2012, 07:03. Available at: http://www.acronymgeek.com/GZK. Accessed February 12, 2012, 07:03. |