| APA | HDL. (2012, February 9). In Acronym Geek. Retrieved 01:43, February 9, 2012, from http://www.acronymgeek.com/HDL |
| MLA | "HDL." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/HDL>. |
| MHRA | 'HDL', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/HDL> [accessed 9 February 2012] |
| Chicago | "HDL", http://www.acronymgeek.com/HDL (accessed February 9, 2012). |
| CBE/CSE | HDL [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/HDL. |
| Bluebook | HDL, http://www.acronymgeek.com/HDL (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDL, http://www.acronymgeek.com/HDL (optional description here) (as of Feb. 9, 2012, 01:43). |
| AMA | HDL. Acronym Geek. February 9, 2012, 01:43. Available at: http://www.acronymgeek.com/HDL. Accessed February 9, 2012, 01:43. |