| APA | OPV. (2012, February 14). In Acronym Geek. Retrieved 07:06, February 14, 2012, from http://www.acronymgeek.com/OPV |
| MLA | "OPV." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OPV>. |
| MHRA | 'OPV', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OPV> [accessed 14 February 2012] |
| Chicago | "OPV", http://www.acronymgeek.com/OPV (accessed February 14, 2012). |
| CBE/CSE | OPV [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OPV. |
| Bluebook | OPV, http://www.acronymgeek.com/OPV (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPV, http://www.acronymgeek.com/OPV (optional description here) (as of Feb. 14, 2012, 07:06). |
| AMA | OPV. Acronym Geek. February 14, 2012, 07:06. Available at: http://www.acronymgeek.com/OPV. Accessed February 14, 2012, 07:06. |