| APA | OPVD. (2012, February 17). In Acronym Geek. Retrieved 00:34, February 17, 2012, from http://www.acronymgeek.com/OPVD |
| MLA | "OPVD." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/OPVD>. |
| MHRA | 'OPVD', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/OPVD> [accessed 17 February 2012] |
| Chicago | "OPVD", http://www.acronymgeek.com/OPVD (accessed February 17, 2012). |
| CBE/CSE | OPVD [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/OPVD. |
| Bluebook | OPVD, http://www.acronymgeek.com/OPVD (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPVD, http://www.acronymgeek.com/OPVD (optional description here) (as of Feb. 17, 2012, 00:34). |
| AMA | OPVD. Acronym Geek. February 17, 2012, 00:34. Available at: http://www.acronymgeek.com/OPVD. Accessed February 17, 2012, 00:34. |