| APA | HUD. (2012, February 9). In Acronym Geek. Retrieved 19:54, February 9, 2012, from http://www.acronymgeek.com/HUD |
| MLA | "HUD." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/HUD>. |
| MHRA | 'HUD', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/HUD> [accessed 9 February 2012] |
| Chicago | "HUD", http://www.acronymgeek.com/HUD (accessed February 9, 2012). |
| CBE/CSE | HUD [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/HUD. |
| Bluebook | HUD, http://www.acronymgeek.com/HUD (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HUD, http://www.acronymgeek.com/HUD (optional description here) (as of Feb. 9, 2012, 19:54). |
| AMA | HUD. Acronym Geek. February 9, 2012, 19:54. Available at: http://www.acronymgeek.com/HUD. Accessed February 9, 2012, 19:54. |