| APA | VPSO. (2012, February 14). In Acronym Geek. Retrieved 12:43, February 14, 2012, from http://www.acronymgeek.com/VPSO |
| MLA | "VPSO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/VPSO>. |
| MHRA | 'VPSO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/VPSO> [accessed 14 February 2012] |
| Chicago | "VPSO", http://www.acronymgeek.com/VPSO (accessed February 14, 2012). |
| CBE/CSE | VPSO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/VPSO. |
| Bluebook | VPSO, http://www.acronymgeek.com/VPSO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VPSO, http://www.acronymgeek.com/VPSO (optional description here) (as of Feb. 14, 2012, 12:43). |
| AMA | VPSO. Acronym Geek. February 14, 2012, 12:43. Available at: http://www.acronymgeek.com/VPSO. Accessed February 14, 2012, 12:43. |