| APA | HBVO. (2012, February 15). In Acronym Geek. Retrieved 12:08, February 15, 2012, from http://www.acronymgeek.com/HBVO |
| MLA | "HBVO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HBVO>. |
| MHRA | 'HBVO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HBVO> [accessed 15 February 2012] |
| Chicago | "HBVO", http://www.acronymgeek.com/HBVO (accessed February 15, 2012). |
| CBE/CSE | HBVO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HBVO. |
| Bluebook | HBVO, http://www.acronymgeek.com/HBVO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBVO, http://www.acronymgeek.com/HBVO (optional description here) (as of Feb. 15, 2012, 12:08). |
| AMA | HBVO. Acronym Geek. February 15, 2012, 12:08. Available at: http://www.acronymgeek.com/HBVO. Accessed February 15, 2012, 12:08. |