| APA | HLDD. (2012, February 16). In Acronym Geek. Retrieved 10:03, February 16, 2012, from http://www.acronymgeek.com/HLDD |
| MLA | "HLDD." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HLDD>. |
| MHRA | 'HLDD', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HLDD> [accessed 16 February 2012] |
| Chicago | "HLDD", http://www.acronymgeek.com/HLDD (accessed February 16, 2012). |
| CBE/CSE | HLDD [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HLDD. |
| Bluebook | HLDD, http://www.acronymgeek.com/HLDD (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HLDD, http://www.acronymgeek.com/HLDD (optional description here) (as of Feb. 16, 2012, 10:03). |
| AMA | HLDD. Acronym Geek. February 16, 2012, 10:03. Available at: http://www.acronymgeek.com/HLDD. Accessed February 16, 2012, 10:03. |