| APA | VYS. (2012, February 9). In Acronym Geek. Retrieved 09:29, February 9, 2012, from http://www.acronymgeek.com/VYS |
| MLA | "VYS." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/VYS>. |
| MHRA | 'VYS', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/VYS> [accessed 9 February 2012] |
| Chicago | "VYS", http://www.acronymgeek.com/VYS (accessed February 9, 2012). |
| CBE/CSE | VYS [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/VYS. |
| Bluebook | VYS, http://www.acronymgeek.com/VYS (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VYS, http://www.acronymgeek.com/VYS (optional description here) (as of Feb. 9, 2012, 09:29). |
| AMA | VYS. Acronym Geek. February 9, 2012, 09:29. Available at: http://www.acronymgeek.com/VYS. Accessed February 9, 2012, 09:29. |