| APA | OPVY. (2012, February 15). In Acronym Geek. Retrieved 01:13, February 15, 2012, from http://www.acronymgeek.com/OPVY |
| MLA | "OPVY." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OPVY>. |
| MHRA | 'OPVY', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OPVY> [accessed 15 February 2012] |
| Chicago | "OPVY", http://www.acronymgeek.com/OPVY (accessed February 15, 2012). |
| CBE/CSE | OPVY [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OPVY. |
| Bluebook | OPVY, http://www.acronymgeek.com/OPVY (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPVY, http://www.acronymgeek.com/OPVY (optional description here) (as of Feb. 15, 2012, 01:13). |
| AMA | OPVY. Acronym Geek. February 15, 2012, 01:13. Available at: http://www.acronymgeek.com/OPVY. Accessed February 15, 2012, 01:13. |