| APA | HU. (2012, February 7). In Acronym Geek. Retrieved 22:51, February 7, 2012, from http://www.acronymgeek.com/HU |
| MLA | "HU." Acronym Geek. (2012). Acronym Geek. 7 Feb 2012 <http://www.acronymgeek.com/HU>. |
| MHRA | 'HU', Acronym Geek, 7 February 2012, <http://www.acronymgeek.com/HU> [accessed 7 February 2012] |
| Chicago | "HU", http://www.acronymgeek.com/HU (accessed February 7, 2012). |
| CBE/CSE | HU [Internet]. Acronym Geek; 2012 Feb 7 [cited 2012 Feb 7]. Available from: http://www.acronymgeek.com/HU. |
| Bluebook | HU, http://www.acronymgeek.com/HU (last visited February 7, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HU, http://www.acronymgeek.com/HU (optional description here) (as of Feb. 7, 2012, 22:51). |
| AMA | HU. Acronym Geek. February 7, 2012, 22:51. Available at: http://www.acronymgeek.com/HU. Accessed February 7, 2012, 22:51. |