| APA | VPN. (2012, February 9). In Acronym Geek. Retrieved 21:07, February 9, 2012, from http://www.acronymgeek.com/VPN |
| MLA | "VPN." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/VPN>. |
| MHRA | 'VPN', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/VPN> [accessed 9 February 2012] |
| Chicago | "VPN", http://www.acronymgeek.com/VPN (accessed February 9, 2012). |
| CBE/CSE | VPN [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/VPN. |
| Bluebook | VPN, http://www.acronymgeek.com/VPN (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VPN, http://www.acronymgeek.com/VPN (optional description here) (as of Feb. 9, 2012, 21:07). |
| AMA | VPN. Acronym Geek. February 9, 2012, 21:07. Available at: http://www.acronymgeek.com/VPN. Accessed February 9, 2012, 21:07. |