| APA | PVOO. (2012, February 15). In Acronym Geek. Retrieved 08:35, February 15, 2012, from http://www.acronymgeek.com/PVOO |
| MLA | "PVOO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PVOO>. |
| MHRA | 'PVOO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PVOO> [accessed 15 February 2012] |
| Chicago | "PVOO", http://www.acronymgeek.com/PVOO (accessed February 15, 2012). |
| CBE/CSE | PVOO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PVOO. |
| Bluebook | PVOO, http://www.acronymgeek.com/PVOO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PVOO, http://www.acronymgeek.com/PVOO (optional description here) (as of Feb. 15, 2012, 08:35). |
| AMA | PVOO. Acronym Geek. February 15, 2012, 08:35. Available at: http://www.acronymgeek.com/PVOO. Accessed February 15, 2012, 08:35. |