| APA | OFSY. (2012, February 15). In Acronym Geek. Retrieved 23:10, February 15, 2012, from http://www.acronymgeek.com/OFSY |
| MLA | "OFSY." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OFSY>. |
| MHRA | 'OFSY', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OFSY> [accessed 15 February 2012] |
| Chicago | "OFSY", http://www.acronymgeek.com/OFSY (accessed February 15, 2012). |
| CBE/CSE | OFSY [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OFSY. |
| Bluebook | OFSY, http://www.acronymgeek.com/OFSY (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OFSY, http://www.acronymgeek.com/OFSY (optional description here) (as of Feb. 15, 2012, 23:10). |
| AMA | OFSY. Acronym Geek. February 15, 2012, 23:10. Available at: http://www.acronymgeek.com/OFSY. Accessed February 15, 2012, 23:10. |