| APA | GSM. (2012, February 13). In Acronym Geek. Retrieved 21:46, February 13, 2012, from http://www.acronymgeek.com/GSM |
| MLA | "GSM." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/GSM>. |
| MHRA | 'GSM', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/GSM> [accessed 13 February 2012] |
| Chicago | "GSM", http://www.acronymgeek.com/GSM (accessed February 13, 2012). |
| CBE/CSE | GSM [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/GSM. |
| Bluebook | GSM, http://www.acronymgeek.com/GSM (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GSM, http://www.acronymgeek.com/GSM (optional description here) (as of Feb. 13, 2012, 21:46). |
| AMA | GSM. Acronym Geek. February 13, 2012, 21:46. Available at: http://www.acronymgeek.com/GSM. Accessed February 13, 2012, 21:46. |