| APA | OPVG. (2012, February 16). In Acronym Geek. Retrieved 05:14, February 16, 2012, from http://www.acronymgeek.com/OPVG |
| MLA | "OPVG." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPVG>. |
| MHRA | 'OPVG', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPVG> [accessed 16 February 2012] |
| Chicago | "OPVG", http://www.acronymgeek.com/OPVG (accessed February 16, 2012). |
| CBE/CSE | OPVG [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPVG. |
| Bluebook | OPVG, http://www.acronymgeek.com/OPVG (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPVG, http://www.acronymgeek.com/OPVG (optional description here) (as of Feb. 16, 2012, 05:14). |
| AMA | OPVG. Acronym Geek. February 16, 2012, 05:14. Available at: http://www.acronymgeek.com/OPVG. Accessed February 16, 2012, 05:14. |