| APA | HTR. (2012, February 9). In Acronym Geek. Retrieved 10:16, February 9, 2012, from http://www.acronymgeek.com/HTR |
| MLA | "HTR." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/HTR>. |
| MHRA | 'HTR', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/HTR> [accessed 9 February 2012] |
| Chicago | "HTR", http://www.acronymgeek.com/HTR (accessed February 9, 2012). |
| CBE/CSE | HTR [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/HTR. |
| Bluebook | HTR, http://www.acronymgeek.com/HTR (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTR, http://www.acronymgeek.com/HTR (optional description here) (as of Feb. 9, 2012, 10:16). |
| AMA | HTR. Acronym Geek. February 9, 2012, 10:16. Available at: http://www.acronymgeek.com/HTR. Accessed February 9, 2012, 10:16. |