| APA | GUOS. (2012, February 15). In Acronym Geek. Retrieved 05:44, February 15, 2012, from http://www.acronymgeek.com/GUOS |
| MLA | "GUOS." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GUOS>. |
| MHRA | 'GUOS', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GUOS> [accessed 15 February 2012] |
| Chicago | "GUOS", http://www.acronymgeek.com/GUOS (accessed February 15, 2012). |
| CBE/CSE | GUOS [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GUOS. |
| Bluebook | GUOS, http://www.acronymgeek.com/GUOS (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GUOS, http://www.acronymgeek.com/GUOS (optional description here) (as of Feb. 15, 2012, 05:44). |
| AMA | GUOS. Acronym Geek. February 15, 2012, 05:44. Available at: http://www.acronymgeek.com/GUOS. Accessed February 15, 2012, 05:44. |