| APA | HBOO. (2012, February 17). In Acronym Geek. Retrieved 03:21, February 17, 2012, from http://www.acronymgeek.com/HBOO |
| MLA | "HBOO." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HBOO>. |
| MHRA | 'HBOO', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HBOO> [accessed 17 February 2012] |
| Chicago | "HBOO", http://www.acronymgeek.com/HBOO (accessed February 17, 2012). |
| CBE/CSE | HBOO [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HBOO. |
| Bluebook | HBOO, http://www.acronymgeek.com/HBOO (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBOO, http://www.acronymgeek.com/HBOO (optional description here) (as of Feb. 17, 2012, 03:21). |
| AMA | HBOO. Acronym Geek. February 17, 2012, 03:21. Available at: http://www.acronymgeek.com/HBOO. Accessed February 17, 2012, 03:21. |