| APA | HBEO. (2012, February 16). In Acronym Geek. Retrieved 16:10, February 16, 2012, from http://www.acronymgeek.com/HBEO |
| MLA | "HBEO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HBEO>. |
| MHRA | 'HBEO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HBEO> [accessed 16 February 2012] |
| Chicago | "HBEO", http://www.acronymgeek.com/HBEO (accessed February 16, 2012). |
| CBE/CSE | HBEO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HBEO. |
| Bluebook | HBEO, http://www.acronymgeek.com/HBEO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBEO, http://www.acronymgeek.com/HBEO (optional description here) (as of Feb. 16, 2012, 16:10). |
| AMA | HBEO. Acronym Geek. February 16, 2012, 16:10. Available at: http://www.acronymgeek.com/HBEO. Accessed February 16, 2012, 16:10. |