| APA | HBOP. (2012, February 16). In Acronym Geek. Retrieved 11:20, February 16, 2012, from http://www.acronymgeek.com/HBOP |
| MLA | "HBOP." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HBOP>. |
| MHRA | 'HBOP', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HBOP> [accessed 16 February 2012] |
| Chicago | "HBOP", http://www.acronymgeek.com/HBOP (accessed February 16, 2012). |
| CBE/CSE | HBOP [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HBOP. |
| Bluebook | HBOP, http://www.acronymgeek.com/HBOP (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBOP, http://www.acronymgeek.com/HBOP (optional description here) (as of Feb. 16, 2012, 11:20). |
| AMA | HBOP. Acronym Geek. February 16, 2012, 11:20. Available at: http://www.acronymgeek.com/HBOP. Accessed February 16, 2012, 11:20. |