| APA | VFOS. (2012, February 15). In Acronym Geek. Retrieved 18:22, February 15, 2012, from http://www.acronymgeek.com/VFOS |
| MLA | "VFOS." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/VFOS>. |
| MHRA | 'VFOS', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/VFOS> [accessed 15 February 2012] |
| Chicago | "VFOS", http://www.acronymgeek.com/VFOS (accessed February 15, 2012). |
| CBE/CSE | VFOS [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/VFOS. |
| Bluebook | VFOS, http://www.acronymgeek.com/VFOS (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VFOS, http://www.acronymgeek.com/VFOS (optional description here) (as of Feb. 15, 2012, 18:22). |
| AMA | VFOS. Acronym Geek. February 15, 2012, 18:22. Available at: http://www.acronymgeek.com/VFOS. Accessed February 15, 2012, 18:22. |