| APA | GUIS. (2012, February 14). In Acronym Geek. Retrieved 01:24, February 14, 2012, from http://www.acronymgeek.com/GUIS |
| MLA | "GUIS." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/GUIS>. |
| MHRA | 'GUIS', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/GUIS> [accessed 14 February 2012] |
| Chicago | "GUIS", http://www.acronymgeek.com/GUIS (accessed February 14, 2012). |
| CBE/CSE | GUIS [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/GUIS. |
| Bluebook | GUIS, http://www.acronymgeek.com/GUIS (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GUIS, http://www.acronymgeek.com/GUIS (optional description here) (as of Feb. 14, 2012, 01:24). |
| AMA | GUIS. Acronym Geek. February 14, 2012, 01:24. Available at: http://www.acronymgeek.com/GUIS. Accessed February 14, 2012, 01:24. |