| APA | VYOP. (2012, February 15). In Acronym Geek. Retrieved 09:19, February 15, 2012, from http://www.acronymgeek.com/VYOP |
| MLA | "VYOP." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/VYOP>. |
| MHRA | 'VYOP', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/VYOP> [accessed 15 February 2012] |
| Chicago | "VYOP", http://www.acronymgeek.com/VYOP (accessed February 15, 2012). |
| CBE/CSE | VYOP [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/VYOP. |
| Bluebook | VYOP, http://www.acronymgeek.com/VYOP (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VYOP, http://www.acronymgeek.com/VYOP (optional description here) (as of Feb. 15, 2012, 09:19). |
| AMA | VYOP. Acronym Geek. February 15, 2012, 09:19. Available at: http://www.acronymgeek.com/VYOP. Accessed February 15, 2012, 09:19. |