| APA | HOR. (2012, February 15). In Acronym Geek. Retrieved 03:49, February 15, 2012, from http://www.acronymgeek.com/HOR |
| MLA | "HOR." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HOR>. |
| MHRA | 'HOR', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HOR> [accessed 15 February 2012] |
| Chicago | "HOR", http://www.acronymgeek.com/HOR (accessed February 15, 2012). |
| CBE/CSE | HOR [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HOR. |
| Bluebook | HOR, http://www.acronymgeek.com/HOR (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HOR, http://www.acronymgeek.com/HOR (optional description here) (as of Feb. 15, 2012, 03:49). |
| AMA | HOR. Acronym Geek. February 15, 2012, 03:49. Available at: http://www.acronymgeek.com/HOR. Accessed February 15, 2012, 03:49. |