| APA | GMK. (2012, February 13). In Acronym Geek. Retrieved 22:42, February 13, 2012, from http://www.acronymgeek.com/GMK |
| MLA | "GMK." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/GMK>. |
| MHRA | 'GMK', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/GMK> [accessed 13 February 2012] |
| Chicago | "GMK", http://www.acronymgeek.com/GMK (accessed February 13, 2012). |
| CBE/CSE | GMK [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/GMK. |
| Bluebook | GMK, http://www.acronymgeek.com/GMK (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GMK, http://www.acronymgeek.com/GMK (optional description here) (as of Feb. 13, 2012, 22:42). |
| AMA | GMK. Acronym Geek. February 13, 2012, 22:42. Available at: http://www.acronymgeek.com/GMK. Accessed February 13, 2012, 22:42. |