| APA | GS1. (2012, February 12). In Acronym Geek. Retrieved 07:01, February 12, 2012, from http://www.acronymgeek.com/GS1 |
| MLA | "GS1." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/GS1>. |
| MHRA | 'GS1', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/GS1> [accessed 12 February 2012] |
| Chicago | "GS1", http://www.acronymgeek.com/GS1 (accessed February 12, 2012). |
| CBE/CSE | GS1 [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/GS1. |
| Bluebook | GS1, http://www.acronymgeek.com/GS1 (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GS1, http://www.acronymgeek.com/GS1 (optional description here) (as of Feb. 12, 2012, 07:01). |
| AMA | GS1. Acronym Geek. February 12, 2012, 07:01. Available at: http://www.acronymgeek.com/GS1. Accessed February 12, 2012, 07:01. |