| APA | GBLK. (2012, February 16). In Acronym Geek. Retrieved 20:25, February 16, 2012, from http://www.acronymgeek.com/GBLK |
| MLA | "GBLK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GBLK>. |
| MHRA | 'GBLK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GBLK> [accessed 16 February 2012] |
| Chicago | "GBLK", http://www.acronymgeek.com/GBLK (accessed February 16, 2012). |
| CBE/CSE | GBLK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GBLK. |
| Bluebook | GBLK, http://www.acronymgeek.com/GBLK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GBLK, http://www.acronymgeek.com/GBLK (optional description here) (as of Feb. 16, 2012, 20:25). |
| AMA | GBLK. Acronym Geek. February 16, 2012, 20:25. Available at: http://www.acronymgeek.com/GBLK. Accessed February 16, 2012, 20:25. |