| APA | VZIS. (2012, February 16). In Acronym Geek. Retrieved 12:30, February 16, 2012, from http://www.acronymgeek.com/VZIS |
| MLA | "VZIS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/VZIS>. |
| MHRA | 'VZIS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/VZIS> [accessed 16 February 2012] |
| Chicago | "VZIS", http://www.acronymgeek.com/VZIS (accessed February 16, 2012). |
| CBE/CSE | VZIS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/VZIS. |
| Bluebook | VZIS, http://www.acronymgeek.com/VZIS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VZIS, http://www.acronymgeek.com/VZIS (optional description here) (as of Feb. 16, 2012, 12:30). |
| AMA | VZIS. Acronym Geek. February 16, 2012, 12:30. Available at: http://www.acronymgeek.com/VZIS. Accessed February 16, 2012, 12:30. |