| APA | HTOA. (2012, February 14). In Acronym Geek. Retrieved 13:59, February 14, 2012, from http://www.acronymgeek.com/HTOA |
| MLA | "HTOA." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HTOA>. |
| MHRA | 'HTOA', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HTOA> [accessed 14 February 2012] |
| Chicago | "HTOA", http://www.acronymgeek.com/HTOA (accessed February 14, 2012). |
| CBE/CSE | HTOA [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HTOA. |
| Bluebook | HTOA, http://www.acronymgeek.com/HTOA (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTOA, http://www.acronymgeek.com/HTOA (optional description here) (as of Feb. 14, 2012, 13:59). |
| AMA | HTOA. Acronym Geek. February 14, 2012, 13:59. Available at: http://www.acronymgeek.com/HTOA. Accessed February 14, 2012, 13:59. |