| APA | PVO. (2012, February 14). In Acronym Geek. Retrieved 10:16, February 14, 2012, from http://www.acronymgeek.com/PVO |
| MLA | "PVO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PVO>. |
| MHRA | 'PVO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PVO> [accessed 14 February 2012] |
| Chicago | "PVO", http://www.acronymgeek.com/PVO (accessed February 14, 2012). |
| CBE/CSE | PVO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PVO. |
| Bluebook | PVO, http://www.acronymgeek.com/PVO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PVO, http://www.acronymgeek.com/PVO (optional description here) (as of Feb. 14, 2012, 10:16). |
| AMA | PVO. Acronym Geek. February 14, 2012, 10:16. Available at: http://www.acronymgeek.com/PVO. Accessed February 14, 2012, 10:16. |