| APA | GFSK. (2012, February 17). In Acronym Geek. Retrieved 00:18, February 17, 2012, from http://www.acronymgeek.com/GFSK |
| MLA | "GFSK." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/GFSK>. |
| MHRA | 'GFSK', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/GFSK> [accessed 17 February 2012] |
| Chicago | "GFSK", http://www.acronymgeek.com/GFSK (accessed February 17, 2012). |
| CBE/CSE | GFSK [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/GFSK. |
| Bluebook | GFSK, http://www.acronymgeek.com/GFSK (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GFSK, http://www.acronymgeek.com/GFSK (optional description here) (as of Feb. 17, 2012, 00:18). |
| AMA | GFSK. Acronym Geek. February 17, 2012, 00:18. Available at: http://www.acronymgeek.com/GFSK. Accessed February 17, 2012, 00:18. |