| APA | HH. (2012, February 14). In Acronym Geek. Retrieved 06:58, February 14, 2012, from http://www.acronymgeek.com/HH |
| MLA | "HH." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HH>. |
| MHRA | 'HH', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HH> [accessed 14 February 2012] |
| Chicago | "HH", http://www.acronymgeek.com/HH (accessed February 14, 2012). |
| CBE/CSE | HH [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HH. |
| Bluebook | HH, http://www.acronymgeek.com/HH (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HH, http://www.acronymgeek.com/HH (optional description here) (as of Feb. 14, 2012, 06:58). |
| AMA | HH. Acronym Geek. February 14, 2012, 06:58. Available at: http://www.acronymgeek.com/HH. Accessed February 14, 2012, 06:58. |