| APA | HTRR. (2012, February 16). In Acronym Geek. Retrieved 22:30, February 16, 2012, from http://www.acronymgeek.com/HTRR |
| MLA | "HTRR." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HTRR>. |
| MHRA | 'HTRR', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HTRR> [accessed 16 February 2012] |
| Chicago | "HTRR", http://www.acronymgeek.com/HTRR (accessed February 16, 2012). |
| CBE/CSE | HTRR [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HTRR. |
| Bluebook | HTRR, http://www.acronymgeek.com/HTRR (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTRR, http://www.acronymgeek.com/HTRR (optional description here) (as of Feb. 16, 2012, 22:30). |
| AMA | HTRR. Acronym Geek. February 16, 2012, 22:30. Available at: http://www.acronymgeek.com/HTRR. Accessed February 16, 2012, 22:30. |