| APA | OYSO. (2012, February 16). In Acronym Geek. Retrieved 20:11, February 16, 2012, from http://www.acronymgeek.com/OYSO |
| MLA | "OYSO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OYSO>. |
| MHRA | 'OYSO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OYSO> [accessed 16 February 2012] |
| Chicago | "OYSO", http://www.acronymgeek.com/OYSO (accessed February 16, 2012). |
| CBE/CSE | OYSO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OYSO. |
| Bluebook | OYSO, http://www.acronymgeek.com/OYSO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OYSO, http://www.acronymgeek.com/OYSO (optional description here) (as of Feb. 16, 2012, 20:11). |
| AMA | OYSO. Acronym Geek. February 16, 2012, 20:11. Available at: http://www.acronymgeek.com/OYSO. Accessed February 16, 2012, 20:11. |