| APA | HKCO. (2012, February 15). In Acronym Geek. Retrieved 04:40, February 15, 2012, from http://www.acronymgeek.com/HKCO |
| MLA | "HKCO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HKCO>. |
| MHRA | 'HKCO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HKCO> [accessed 15 February 2012] |
| Chicago | "HKCO", http://www.acronymgeek.com/HKCO (accessed February 15, 2012). |
| CBE/CSE | HKCO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HKCO. |
| Bluebook | HKCO, http://www.acronymgeek.com/HKCO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKCO, http://www.acronymgeek.com/HKCO (optional description here) (as of Feb. 15, 2012, 04:40). |
| AMA | HKCO. Acronym Geek. February 15, 2012, 04:40. Available at: http://www.acronymgeek.com/HKCO. Accessed February 15, 2012, 04:40. |