| APA | PVOS. (2012, February 16). In Acronym Geek. Retrieved 22:19, February 16, 2012, from http://www.acronymgeek.com/PVOS |
| MLA | "PVOS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PVOS>. |
| MHRA | 'PVOS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PVOS> [accessed 16 February 2012] |
| Chicago | "PVOS", http://www.acronymgeek.com/PVOS (accessed February 16, 2012). |
| CBE/CSE | PVOS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PVOS. |
| Bluebook | PVOS, http://www.acronymgeek.com/PVOS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PVOS, http://www.acronymgeek.com/PVOS (optional description here) (as of Feb. 16, 2012, 22:19). |
| AMA | PVOS. Acronym Geek. February 16, 2012, 22:19. Available at: http://www.acronymgeek.com/PVOS. Accessed February 16, 2012, 22:19. |