| APA | HKOH. (2012, February 15). In Acronym Geek. Retrieved 23:17, February 15, 2012, from http://www.acronymgeek.com/HKOH |
| MLA | "HKOH." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HKOH>. |
| MHRA | 'HKOH', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HKOH> [accessed 15 February 2012] |
| Chicago | "HKOH", http://www.acronymgeek.com/HKOH (accessed February 15, 2012). |
| CBE/CSE | HKOH [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HKOH. |
| Bluebook | HKOH, http://www.acronymgeek.com/HKOH (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKOH, http://www.acronymgeek.com/HKOH (optional description here) (as of Feb. 15, 2012, 23:17). |
| AMA | HKOH. Acronym Geek. February 15, 2012, 23:17. Available at: http://www.acronymgeek.com/HKOH. Accessed February 15, 2012, 23:17. |