| APA | HBAK. (2012, February 15). In Acronym Geek. Retrieved 17:24, February 15, 2012, from http://www.acronymgeek.com/HBAK |
| MLA | "HBAK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HBAK>. |
| MHRA | 'HBAK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HBAK> [accessed 15 February 2012] |
| Chicago | "HBAK", http://www.acronymgeek.com/HBAK (accessed February 15, 2012). |
| CBE/CSE | HBAK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HBAK. |
| Bluebook | HBAK, http://www.acronymgeek.com/HBAK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBAK, http://www.acronymgeek.com/HBAK (optional description here) (as of Feb. 15, 2012, 17:24). |
| AMA | HBAK. Acronym Geek. February 15, 2012, 17:24. Available at: http://www.acronymgeek.com/HBAK. Accessed February 15, 2012, 17:24. |