| APA | HKYO. (2012, February 15). In Acronym Geek. Retrieved 18:29, February 15, 2012, from http://www.acronymgeek.com/HKYO |
| MLA | "HKYO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HKYO>. |
| MHRA | 'HKYO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HKYO> [accessed 15 February 2012] |
| Chicago | "HKYO", http://www.acronymgeek.com/HKYO (accessed February 15, 2012). |
| CBE/CSE | HKYO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HKYO. |
| Bluebook | HKYO, http://www.acronymgeek.com/HKYO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKYO, http://www.acronymgeek.com/HKYO (optional description here) (as of Feb. 15, 2012, 18:29). |
| AMA | HKYO. Acronym Geek. February 15, 2012, 18:29. Available at: http://www.acronymgeek.com/HKYO. Accessed February 15, 2012, 18:29. |