| APA | HDDE. (2012, February 16). In Acronym Geek. Retrieved 06:55, February 16, 2012, from http://www.acronymgeek.com/HDDE |
| MLA | "HDDE." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HDDE>. |
| MHRA | 'HDDE', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HDDE> [accessed 16 February 2012] |
| Chicago | "HDDE", http://www.acronymgeek.com/HDDE (accessed February 16, 2012). |
| CBE/CSE | HDDE [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HDDE. |
| Bluebook | HDDE, http://www.acronymgeek.com/HDDE (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDDE, http://www.acronymgeek.com/HDDE (optional description here) (as of Feb. 16, 2012, 06:55). |
| AMA | HDDE. Acronym Geek. February 16, 2012, 06:55. Available at: http://www.acronymgeek.com/HDDE. Accessed February 16, 2012, 06:55. |