| APA | GBK. (2012, February 14). In Acronym Geek. Retrieved 07:33, February 14, 2012, from http://www.acronymgeek.com/GBK |
| MLA | "GBK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/GBK>. |
| MHRA | 'GBK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/GBK> [accessed 14 February 2012] |
| Chicago | "GBK", http://www.acronymgeek.com/GBK (accessed February 14, 2012). |
| CBE/CSE | GBK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/GBK. |
| Bluebook | GBK, http://www.acronymgeek.com/GBK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GBK, http://www.acronymgeek.com/GBK (optional description here) (as of Feb. 14, 2012, 07:33). |
| AMA | GBK. Acronym Geek. February 14, 2012, 07:33. Available at: http://www.acronymgeek.com/GBK. Accessed February 14, 2012, 07:33. |