| APA | OYSA. (2012, February 17). In Acronym Geek. Retrieved 07:25, February 17, 2012, from http://www.acronymgeek.com/OYSA |
| MLA | "OYSA." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/OYSA>. |
| MHRA | 'OYSA', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/OYSA> [accessed 17 February 2012] |
| Chicago | "OYSA", http://www.acronymgeek.com/OYSA (accessed February 17, 2012). |
| CBE/CSE | OYSA [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/OYSA. |
| Bluebook | OYSA, http://www.acronymgeek.com/OYSA (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OYSA, http://www.acronymgeek.com/OYSA (optional description here) (as of Feb. 17, 2012, 07:25). |
| AMA | OYSA. Acronym Geek. February 17, 2012, 07:25. Available at: http://www.acronymgeek.com/OYSA. Accessed February 17, 2012, 07:25. |