| APA | VCO. (2012, February 9). In Acronym Geek. Retrieved 21:11, February 9, 2012, from http://www.acronymgeek.com/VCO |
| MLA | "VCO." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/VCO>. |
| MHRA | 'VCO', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/VCO> [accessed 9 February 2012] |
| Chicago | "VCO", http://www.acronymgeek.com/VCO (accessed February 9, 2012). |
| CBE/CSE | VCO [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/VCO. |
| Bluebook | VCO, http://www.acronymgeek.com/VCO (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, VCO, http://www.acronymgeek.com/VCO (optional description here) (as of Feb. 9, 2012, 21:11). |
| AMA | VCO. Acronym Geek. February 9, 2012, 21:11. Available at: http://www.acronymgeek.com/VCO. Accessed February 9, 2012, 21:11. |