| APA | HHDE. (2012, February 17). In Acronym Geek. Retrieved 00:43, February 17, 2012, from http://www.acronymgeek.com/HHDE |
| MLA | "HHDE." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HHDE>. |
| MHRA | 'HHDE', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HHDE> [accessed 17 February 2012] |
| Chicago | "HHDE", http://www.acronymgeek.com/HHDE (accessed February 17, 2012). |
| CBE/CSE | HHDE [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HHDE. |
| Bluebook | HHDE, http://www.acronymgeek.com/HHDE (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHDE, http://www.acronymgeek.com/HHDE (optional description here) (as of Feb. 17, 2012, 00:43). |
| AMA | HHDE. Acronym Geek. February 17, 2012, 00:43. Available at: http://www.acronymgeek.com/HHDE. Accessed February 17, 2012, 00:43. |