| APA | VZO. (2012, February 11). In Acronym Geek. Retrieved 22:28, February 11, 2012, from http://www.acronymgeek.com/VZO |
| MLA | "VZO." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/VZO>. |
| MHRA | 'VZO', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/VZO> [accessed 11 February 2012] |
| Chicago | "VZO", http://www.acronymgeek.com/VZO (accessed February 11, 2012). |
| CBE/CSE | VZO [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/VZO. |
| Bluebook | VZO, http://www.acronymgeek.com/VZO (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VZO, http://www.acronymgeek.com/VZO (optional description here) (as of Feb. 11, 2012, 22:28). |
| AMA | VZO. Acronym Geek. February 11, 2012, 22:28. Available at: http://www.acronymgeek.com/VZO. Accessed February 11, 2012, 22:28. |