| APA | HHX. (2012, February 13). In Acronym Geek. Retrieved 23:29, February 13, 2012, from http://www.acronymgeek.com/HHX |
| MLA | "HHX." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/HHX>. |
| MHRA | 'HHX', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/HHX> [accessed 13 February 2012] |
| Chicago | "HHX", http://www.acronymgeek.com/HHX (accessed February 13, 2012). |
| CBE/CSE | HHX [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/HHX. |
| Bluebook | HHX, http://www.acronymgeek.com/HHX (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHX, http://www.acronymgeek.com/HHX (optional description here) (as of Feb. 13, 2012, 23:29). |
| AMA | HHX. Acronym Geek. February 13, 2012, 23:29. Available at: http://www.acronymgeek.com/HHX. Accessed February 13, 2012, 23:29. |