| APA | HTAO. (2012, February 15). In Acronym Geek. Retrieved 11:22, February 15, 2012, from http://www.acronymgeek.com/HTAO |
| MLA | "HTAO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HTAO>. |
| MHRA | 'HTAO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HTAO> [accessed 15 February 2012] |
| Chicago | "HTAO", http://www.acronymgeek.com/HTAO (accessed February 15, 2012). |
| CBE/CSE | HTAO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HTAO. |
| Bluebook | HTAO, http://www.acronymgeek.com/HTAO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTAO, http://www.acronymgeek.com/HTAO (optional description here) (as of Feb. 15, 2012, 11:22). |
| AMA | HTAO. Acronym Geek. February 15, 2012, 11:22. Available at: http://www.acronymgeek.com/HTAO. Accessed February 15, 2012, 11:22. |