| APA | HBTO. (2012, February 16). In Acronym Geek. Retrieved 04:44, February 16, 2012, from http://www.acronymgeek.com/HBTO |
| MLA | "HBTO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HBTO>. |
| MHRA | 'HBTO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HBTO> [accessed 16 February 2012] |
| Chicago | "HBTO", http://www.acronymgeek.com/HBTO (accessed February 16, 2012). |
| CBE/CSE | HBTO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HBTO. |
| Bluebook | HBTO, http://www.acronymgeek.com/HBTO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBTO, http://www.acronymgeek.com/HBTO (optional description here) (as of Feb. 16, 2012, 04:44). |
| AMA | HBTO. Acronym Geek. February 16, 2012, 04:44. Available at: http://www.acronymgeek.com/HBTO. Accessed February 16, 2012, 04:44. |