| APA | HKOC. (2012, February 16). In Acronym Geek. Retrieved 06:39, February 16, 2012, from http://www.acronymgeek.com/HKOC |
| MLA | "HKOC." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HKOC>. |
| MHRA | 'HKOC', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HKOC> [accessed 16 February 2012] |
| Chicago | "HKOC", http://www.acronymgeek.com/HKOC (accessed February 16, 2012). |
| CBE/CSE | HKOC [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HKOC. |
| Bluebook | HKOC, http://www.acronymgeek.com/HKOC (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKOC, http://www.acronymgeek.com/HKOC (optional description here) (as of Feb. 16, 2012, 06:39). |
| AMA | HKOC. Acronym Geek. February 16, 2012, 06:39. Available at: http://www.acronymgeek.com/HKOC. Accessed February 16, 2012, 06:39. |