| APA | HKDI. (2012, February 16). In Acronym Geek. Retrieved 03:30, February 16, 2012, from http://www.acronymgeek.com/HKDI |
| MLA | "HKDI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HKDI>. |
| MHRA | 'HKDI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HKDI> [accessed 16 February 2012] |
| Chicago | "HKDI", http://www.acronymgeek.com/HKDI (accessed February 16, 2012). |
| CBE/CSE | HKDI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HKDI. |
| Bluebook | HKDI, http://www.acronymgeek.com/HKDI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKDI, http://www.acronymgeek.com/HKDI (optional description here) (as of Feb. 16, 2012, 03:30). |
| AMA | HKDI. Acronym Geek. February 16, 2012, 03:30. Available at: http://www.acronymgeek.com/HKDI. Accessed February 16, 2012, 03:30. |