| APA | HBSO. (2012, February 16). In Acronym Geek. Retrieved 00:38, February 16, 2012, from http://www.acronymgeek.com/HBSO |
| MLA | "HBSO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HBSO>. |
| MHRA | 'HBSO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HBSO> [accessed 16 February 2012] |
| Chicago | "HBSO", http://www.acronymgeek.com/HBSO (accessed February 16, 2012). |
| CBE/CSE | HBSO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HBSO. |
| Bluebook | HBSO, http://www.acronymgeek.com/HBSO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBSO, http://www.acronymgeek.com/HBSO (optional description here) (as of Feb. 16, 2012, 00:38). |
| AMA | HBSO. Acronym Geek. February 16, 2012, 00:38. Available at: http://www.acronymgeek.com/HBSO. Accessed February 16, 2012, 00:38. |