| APA | GSF. (2012, February 13). In Acronym Geek. Retrieved 23:21, February 13, 2012, from http://www.acronymgeek.com/GSF |
| MLA | "GSF." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/GSF>. |
| MHRA | 'GSF', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/GSF> [accessed 13 February 2012] |
| Chicago | "GSF", http://www.acronymgeek.com/GSF (accessed February 13, 2012). |
| CBE/CSE | GSF [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/GSF. |
| Bluebook | GSF, http://www.acronymgeek.com/GSF (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GSF, http://www.acronymgeek.com/GSF (optional description here) (as of Feb. 13, 2012, 23:21). |
| AMA | GSF. Acronym Geek. February 13, 2012, 23:21. Available at: http://www.acronymgeek.com/GSF. Accessed February 13, 2012, 23:21. |