| APA | VYIS. (2012, February 16). In Acronym Geek. Retrieved 01:33, February 16, 2012, from http://www.acronymgeek.com/VYIS |
| MLA | "VYIS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/VYIS>. |
| MHRA | 'VYIS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/VYIS> [accessed 16 February 2012] |
| Chicago | "VYIS", http://www.acronymgeek.com/VYIS (accessed February 16, 2012). |
| CBE/CSE | VYIS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/VYIS. |
| Bluebook | VYIS, http://www.acronymgeek.com/VYIS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VYIS, http://www.acronymgeek.com/VYIS (optional description here) (as of Feb. 16, 2012, 01:33). |
| AMA | VYIS. Acronym Geek. February 16, 2012, 01:33. Available at: http://www.acronymgeek.com/VYIS. Accessed February 16, 2012, 01:33. |