| APA | HLDK. (2012, February 15). In Acronym Geek. Retrieved 06:52, February 15, 2012, from http://www.acronymgeek.com/HLDK |
| MLA | "HLDK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HLDK>. |
| MHRA | 'HLDK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HLDK> [accessed 15 February 2012] |
| Chicago | "HLDK", http://www.acronymgeek.com/HLDK (accessed February 15, 2012). |
| CBE/CSE | HLDK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HLDK. |
| Bluebook | HLDK, http://www.acronymgeek.com/HLDK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HLDK, http://www.acronymgeek.com/HLDK (optional description here) (as of Feb. 15, 2012, 06:52). |
| AMA | HLDK. Acronym Geek. February 15, 2012, 06:52. Available at: http://www.acronymgeek.com/HLDK. Accessed February 15, 2012, 06:52. |