| APA | HKOU. (2012, February 15). In Acronym Geek. Retrieved 14:10, February 15, 2012, from http://www.acronymgeek.com/HKOU |
| MLA | "HKOU." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HKOU>. |
| MHRA | 'HKOU', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HKOU> [accessed 15 February 2012] |
| Chicago | "HKOU", http://www.acronymgeek.com/HKOU (accessed February 15, 2012). |
| CBE/CSE | HKOU [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HKOU. |
| Bluebook | HKOU, http://www.acronymgeek.com/HKOU (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKOU, http://www.acronymgeek.com/HKOU (optional description here) (as of Feb. 15, 2012, 14:10). |
| AMA | HKOU. Acronym Geek. February 15, 2012, 14:10. Available at: http://www.acronymgeek.com/HKOU. Accessed February 15, 2012, 14:10. |