| APA | VPI. (2012, February 10). In Acronym Geek. Retrieved 11:11, February 10, 2012, from http://www.acronymgeek.com/VPI |
| MLA | "VPI." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/VPI>. |
| MHRA | 'VPI', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/VPI> [accessed 10 February 2012] |
| Chicago | "VPI", http://www.acronymgeek.com/VPI (accessed February 10, 2012). |
| CBE/CSE | VPI [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/VPI. |
| Bluebook | VPI, http://www.acronymgeek.com/VPI (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VPI, http://www.acronymgeek.com/VPI (optional description here) (as of Feb. 10, 2012, 11:11). |
| AMA | VPI. Acronym Geek. February 10, 2012, 11:11. Available at: http://www.acronymgeek.com/VPI. Accessed February 10, 2012, 11:11. |