| APA | GSIS. (2012, February 11). In Acronym Geek. Retrieved 22:20, February 11, 2012, from http://www.acronymgeek.com/GSIS |
| MLA | "GSIS." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/GSIS>. |
| MHRA | 'GSIS', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/GSIS> [accessed 11 February 2012] |
| Chicago | "GSIS", http://www.acronymgeek.com/GSIS (accessed February 11, 2012). |
| CBE/CSE | GSIS [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/GSIS. |
| Bluebook | GSIS, http://www.acronymgeek.com/GSIS (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GSIS, http://www.acronymgeek.com/GSIS (optional description here) (as of Feb. 11, 2012, 22:20). |
| AMA | GSIS. Acronym Geek. February 11, 2012, 22:20. Available at: http://www.acronymgeek.com/GSIS. Accessed February 11, 2012, 22:20. |