| APA | OPVS. (2012, February 17). In Acronym Geek. Retrieved 05:27, February 17, 2012, from http://www.acronymgeek.com/OPVS |
| MLA | "OPVS." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/OPVS>. |
| MHRA | 'OPVS', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/OPVS> [accessed 17 February 2012] |
| Chicago | "OPVS", http://www.acronymgeek.com/OPVS (accessed February 17, 2012). |
| CBE/CSE | OPVS [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/OPVS. |
| Bluebook | OPVS, http://www.acronymgeek.com/OPVS (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPVS, http://www.acronymgeek.com/OPVS (optional description here) (as of Feb. 17, 2012, 05:27). |
| AMA | OPVS. Acronym Geek. February 17, 2012, 05:27. Available at: http://www.acronymgeek.com/OPVS. Accessed February 17, 2012, 05:27. |