| APA | HTRO. (2012, February 14). In Acronym Geek. Retrieved 15:43, February 14, 2012, from http://www.acronymgeek.com/HTRO |
| MLA | "HTRO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HTRO>. |
| MHRA | 'HTRO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HTRO> [accessed 14 February 2012] |
| Chicago | "HTRO", http://www.acronymgeek.com/HTRO (accessed February 14, 2012). |
| CBE/CSE | HTRO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HTRO. |
| Bluebook | HTRO, http://www.acronymgeek.com/HTRO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTRO, http://www.acronymgeek.com/HTRO (optional description here) (as of Feb. 14, 2012, 15:43). |
| AMA | HTRO. Acronym Geek. February 14, 2012, 15:43. Available at: http://www.acronymgeek.com/HTRO. Accessed February 14, 2012, 15:43. |