| APA | HTO. (2012, February 11). In Acronym Geek. Retrieved 06:46, February 11, 2012, from http://www.acronymgeek.com/HTO |
| MLA | "HTO." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/HTO>. |
| MHRA | 'HTO', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/HTO> [accessed 11 February 2012] |
| Chicago | "HTO", http://www.acronymgeek.com/HTO (accessed February 11, 2012). |
| CBE/CSE | HTO [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/HTO. |
| Bluebook | HTO, http://www.acronymgeek.com/HTO (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTO, http://www.acronymgeek.com/HTO (optional description here) (as of Feb. 11, 2012, 06:46). |
| AMA | HTO. Acronym Geek. February 11, 2012, 06:46. Available at: http://www.acronymgeek.com/HTO. Accessed February 11, 2012, 06:46. |