| APA | HKDO. (2012, February 14). In Acronym Geek. Retrieved 14:41, February 14, 2012, from http://www.acronymgeek.com/HKDO |
| MLA | "HKDO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HKDO>. |
| MHRA | 'HKDO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HKDO> [accessed 14 February 2012] |
| Chicago | "HKDO", http://www.acronymgeek.com/HKDO (accessed February 14, 2012). |
| CBE/CSE | HKDO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HKDO. |
| Bluebook | HKDO, http://www.acronymgeek.com/HKDO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKDO, http://www.acronymgeek.com/HKDO (optional description here) (as of Feb. 14, 2012, 14:41). |
| AMA | HKDO. Acronym Geek. February 14, 2012, 14:41. Available at: http://www.acronymgeek.com/HKDO. Accessed February 14, 2012, 14:41. |