| APA | YCOS. (2012, February 15). In Acronym Geek. Retrieved 17:25, February 15, 2012, from http://www.acronymgeek.com/YCOS |
| MLA | "YCOS." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/YCOS>. |
| MHRA | 'YCOS', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/YCOS> [accessed 15 February 2012] |
| Chicago | "YCOS", http://www.acronymgeek.com/YCOS (accessed February 15, 2012). |
| CBE/CSE | YCOS [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/YCOS. |
| Bluebook | YCOS, http://www.acronymgeek.com/YCOS (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, YCOS, http://www.acronymgeek.com/YCOS (optional description here) (as of Feb. 15, 2012, 17:25). |
| AMA | YCOS. Acronym Geek. February 15, 2012, 17:25. Available at: http://www.acronymgeek.com/YCOS. Accessed February 15, 2012, 17:25. |